Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50841e20fb16f3f…

MALICIOUS

PDF

77.3 KB Created: 2021-04-07 23:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8ff54152f3731aeb7ec052673da5e575 SHA-1: ac47465aa9128b830cd227461a70b5637c86165b SHA-256: b50841e20fb16f3f278366c7ade5e33e64196af697e4c957ec9b0df10ae80b50
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites for phishing or to download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://ponafet.ru/wix?keyword=cellular+respiration+review+worksheet+pdf PDF link annotation
    • http://gixapedotamerow.mywebcommunity.org/fiboviforelojubuj.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/igjjggc/island_war_game.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/vYOjhjf/era_of_warring_states_japan.pdfIn PDF document text
    • https://cdn.sqhk.co/dexavoba/aasheja/value_proposition_canvas_example_banking.pdfIn PDF document text
    • http://tegotapiw.scienceontheweb.net/58291066145.pdfIn PDF document text
    • https://cdn.sqhk.co/tukutabu/kbjhnQd/gamujopoxed.pdfIn PDF document text
    • http://xunetokawetik.sportsontheweb.net/sheet_metal_forming_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zilidadakole/cdyiahi/three_kingdoms_destiny_heroes_hack.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/9953292195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/zalurasog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c3eac6-a625-4313-b56c-d4da6bcce106/how_to_install_goaliath_54_in-ground_basketball_hoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5fb436-bbf4-49bd-898a-0bc77042936f/call_of_cthulhu_7th_edition_character_sheet_editable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e192616c-aa40-4e7d-8f1a-e7d59e6f02a7/the_cross_and_the_switchblade_movie_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/zugakugetuvorogasev.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/cisco_ios_ipv6_configuration_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/anna_todd_after_book_1_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ba8674-e69c-4b4e-abb3-b9c50326942a/how_to_turn_diagnostics_on_casio_fx-9750gii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6d5d73-6ea4-4d75-9fa3-e0eb5da4e094/how_do_you_reset_a_linear_garage_door_remote.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_e7f33d47eee342469f75053f6d15a70f.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_c949ff1fff4d4caea4ab43b0a66baaff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/veta_spoken_english_video_free.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 5252 bytes
SHA-256: c4af783604cbb4123371dd2ecdb48f6fdf0e255c06c2ed73d3c7a34243eb946d
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 11156 bytes
SHA-256: 56e591739fe48b552bc114c5c7f89d809d003f82bba5f7998a1f84bb178032e7