Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c1c7f7ef82b5af…

MALICIOUS

PDF

82.8 KB Created: 2021-03-12 10:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: beffade1f16057c5cf7fb7ac3eeb2d78 SHA-1: dfec8626b4978e4675ffe5436c3649c4f3ecf863 SHA-256: d5c1c7f7ef82b5afb3f04110356e427c6cfed9baf8be82d204523fd315ba3c1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains numerous external URIs, with one specifically pointing to a URL containing 'cool fonts for instagram apk pro', suggesting a deceptive download attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/123?utm_term=cool+fonts+for+instagram+apk+pro PDF link annotation
    • https://cdn.sqhk.co/xewasejeve/ejjheha/jobaput.pdfIn PDF document text
    • http://sellamorem.com/57529246712jev92.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/LoFlghy/20213097772.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/hafgigf/2359427039.pdfIn PDF document text
    • https://cdn.sqhk.co/sivumazudi/rhbhfge/pilot_freight_services.pdfIn PDF document text
    • http://zelimuletugebak.22web.org/the_monsters_and_the_critics_and_other_essays.pdfIn PDF document text
    • https://cdn.sqhk.co/xojafimib/CkBAxjh/baby_nursery_tamil_rhymes_video_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/retirifurew/jhKibgi/nebapetixovakomezamapojuv.pdfIn PDF document text
    • http://bossyonlinex.com/binary_number_system_freejwggu.pdfIn PDF document text
    • https://cdn.sqhk.co/tireronerogo/DMgcrje/idle_lumberjack_3d_weapons.pdfIn PDF document text
    • http://lotto-investclub.com/magna_carta_cloze_activity_answersmc2cm.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/7LgjBgc/10948734411.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/Xhjiejj/start_page_chrome_extension.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/bbkjbrb/world_of_cartoon_tanks.pdfIn PDF document text
    • http://promoocaoameericanas.com/korg_sv-1_73_dimensionss271i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajoleturib.rf.gd/are_you_supposed_to_bounce_the_ball_in_beer_pong.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/masivapowe.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/iaea_report_iran_2003.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/pomifiradofajavuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64c9f86-2079-4f85-a19f-5c945ef9fff9/free_printable_ukulele_chord_chart_with_finger_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236d5e41-068f-411a-8d9d-d1e863930766/the_winds_twelve_quarters_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f512a6-5d5a-4b44-889e-026698d1da7d/what_is_a_scouts.pdfIn PDF document text
    • http://vezuzatutuxi.epizy.com/wofadinojewegoxasen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/104ec08e-d9d5-426a-ab98-7a0879d010be/lewag.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/free_omegle_video_call_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/dumuduwejudinuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d634ce-c839-4898-9423-4c1b81fcabd4/how_much_does_it_cost_to_get_a_cuckoo_clock_repair.pdfIn PDF document text
    • http://tubofebagadupa.epizy.com/35363193402.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 5192 bytes
SHA-256: 1d126dabe2dafc5365e579d69774ac64d480ab356d7ae07ea110a0556d5f582d
font_02_sfnt_off00010ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE3 14952 bytes
SHA-256: 50cc27863910c44bba99a7131b9d37a3ac4e4ae0638bbe85acb1e429e951b59d

Open this report in the interactive analyzer, or submit your own file for analysis.