Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7a92200e467287…

MALICIOUS

PDF

86.8 KB Created: 2021-03-16 08:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c4a009d7a3b6a0a64579a4e2a2d570fa SHA-1: 060cc007d6f5faf8afae416516fb14b3ecf9f33e SHA-256: 1a7a92200e46728729b413416b5adf1dd046ceda5b3e68aab7dcf0f507026c37
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or SEO manipulation attempt. The malformed stream length and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://midufefew.ru/wix?keyword=maplestory+monster+collection PDF link annotation
    • https://kigekasomek.weebly.com/uploads/1/3/4/5/134598498/839020.pdfIn PDF document text
    • http://openlait.pro/free_sheet_music_making_websitesixb39.pdfIn PDF document text
    • http://kvrovk.xyz/crafting_and_executing_strategy_21sth37dh.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/5jdTjiR/are_brain_training_programs_effective_experiments.pdfIn PDF document text
    • https://cdn.sqhk.co/jawakagufu/gfgcMWt/6504324172.pdfIn PDF document text
    • http://verenica.net/dragon_warrior_monsters_2_monster_listgsj43.pdfIn PDF document text
    • http://hq-cleartv.info/sistema_renina_angiotensina_aldosterona_medigraphicxpdph.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/jejeifP/happy_birthday_cake_photos_com.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_5feaeda52c920.pdfIn PDF document text
    • http://5coupons.info/how_to_take_a_video_on_a_nikon_d5200hw21h.pdfIn PDF document text
    • http://fullpisetc.ru/mantis_tiller_manual_7225hdg5y.pdfIn PDF document text
    • http://bbcua.site/super_mario_run_world_2-_3_black_coins8sgjy.pdfIn PDF document text
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/jelebesolumumar.pdfIn PDF document text
    • http://immortal-sho.club/idle_trainer_monster_dash_apk3rds1.pdfIn PDF document text
    • https://gumotamilo.weebly.com/uploads/1/3/5/3/135319527/7537671.pdfIn PDF document text
    • http://redita.fun/anne_frank_powerpoint_tesfloa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5fffa16dee175.pdfIn PDF document text
    • http://izzzaaa.space/how_to_assemble_ikea_kallax_shelfpn66g.pdfIn PDF document text
    • http://fbcopyright-center.com/zakinarajo5vyy5.pdfIn PDF document text
    • http://titanovyi-filtr.ru/sixufovuduxagefaf0pb3p.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/hav34if/space_ranger_roger_characters.pdfIn PDF document text
    • https://nizedavigo.weebly.com/uploads/1/3/4/8/134879015/fadasevo.pdfIn PDF document text
    • http://rollernefritmassage.xyz/best_free_stargazing_app_iosdn31q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 5188 bytes
SHA-256: 1c7e65eff2d17dcb12460f9ec99d2f1215b32fa9eb5cd313cb161b59621e0d6a
font_01_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 11312 bytes
SHA-256: 420b10b735c38d5498e2097c9aa4f2b9780ac4843266b531c447be1ecb5639a9

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