Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22fe3d49218f97c…

MALICIOUS

PDF

77.9 KB Created: 2021-03-21 22:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 93043c05767be1e20e2852ce7c6b9293 SHA-1: 9be8094ac8385f03d300a4d1b18eab513a9c4cf7 SHA-256: b22fe3d49218f97c456e443076aee3f9b84c884e92cd08c8a4e7d6b8355f3936
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting it is designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were extracted, the structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=understanding+life+sciences+grade+12+third+edition+pdf PDF link annotation
    • http://world-wild-shop.com/ram_dass_quotes_on_lovebyesk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_60431e4f758f6.pdfIn PDF document text
    • http://heliusdesign.ru/pumux320tx.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/hf1N4V0/dr_rama_kongara_baton_rouge_louisiana.pdfIn PDF document text
    • http://ergors.space/577454297785g2mf.pdfIn PDF document text
    • http://wiinorama.space/warwick_paris_former_hotel_warwick_champs-_elyseesskjdb.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/aOagi1P/wilomoribejeleveguvonuza.pdfIn PDF document text
    • https://cdn.sqhk.co/kotolodegag/Bnid7zI/surah_al_mulk_arabic_text.pdfIn PDF document text
    • http://shoop-fm.ru/71031478038y67ty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_602076b66791a.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/LMhjbhd/badlapur_full_movie_123mkv.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/CtggjiM/shinee_ring_ding_dong_music_video.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/aW9Pggi/my_tcc_tulsa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_557f93ffee5e4b24b4233b56368d7d96.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_1ea505e4c1b14e2cabbbd40861e79d7f.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_333028b8b1c746b7b96560cb062aabdd.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_76273b4589bf4cb6a4f45579a727c8fa.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_fa5f511d35d64217b1bd7c71c85811da.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_f18a9414ec4a4ee2a3a8d770432ac2af.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_20f7fbf34eef4a1f94770839f91dd0c8.pdf?index=trueIn 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_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 5592 bytes
SHA-256: bb5a257a76f5596c65270917f7b506978bb13f3ed9388577d3006d1c58eecba9
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 11988 bytes
SHA-256: 202ba1fa3a155311e90195293ab0a1180090e25bc3167dc9245aa0de032e805f