Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a7bd392ea04682…

MALICIOUS

PDF

69.5 KB Created: 2021-04-01 08:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02ac5416408f0d9ef7da1c75e33a6907 SHA-1: 417345319b6f06fe74b5646981e242eb4496b4c5 SHA-256: 41a7bd392ea04682f8a72e252d6dc82882c0bda0495ed2fba1970dc22583a14d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to distribute malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://cdn.sqhk.co/tibakekavero/ezN9ZJe/31120731923.pdf In PDF document text
    • http://pazefezos.mywebcommunity.org/las_capitulaciones_de_santa_fe.pdfIn PDF document text
    • http://desokore.medianewsonline.com/78442331354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467017/normal_602a94b0d10f4.pdfIn PDF document text
    • http://wedurorokim.mypressonline.com/boleslaw_prus_the_doll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_602b65ffd580b.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/hfmhcih/2487532934.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/mHrPhfL/fm_17_wonderkids_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/vShiifd/5056313939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420430/normal_5ff4fc3a84b39.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/jJjdAZl/candyman_movie_2020_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/ht3w0hf/knife_sharpener_rod_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_60220bd60ee59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_6046b9a156662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483870/normal_6009413b16b0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465719/normal_5fccfd1b2bac5.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/iNEjbjj/big_baby_miller.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476418/normal_5fcce3746f7a5.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/64678004405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=how%20to%20adjust%20genie%20pro%20screw%20drive%20garage%20door%20openerPDF link annotation
    • https://s3.amazonaws.com/figugipopar/5944330604.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/70995496201.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/call_of_heroes_chinese_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC700 5280 bytes
SHA-256: 321bc85d54fda65a09de5167263ca2e43b9fc219be5329ae5658e20ecd06c1ff
font_01_sfnt_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 9676 bytes
SHA-256: 22b4b9f172d92dcf4d1fd0f92192906e39a7610fb0cb501ba6b6039c0c3ebd42
font_02_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378