Malicious PDF — malware analysis report

Static analysis result for SHA-256 391ee73505b2945a…

MALICIOUS

PDF

76.6 KB Created: 2021-04-02 13:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 17eb7a141e6e198bf903b453999997ca SHA-1: 5b1a3373cea667c58b2e4ea7b7bdcbe724cf6359 SHA-256: 391ee73505b2945ac94f91b18b853c0b37f5e88d71a4b8e9a3a0bb2b7c979a21
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://vilenefex.ru/award?keyword=7+continents+and+oceans+map+pdf PDF link annotation
    • https://cdn.sqhk.co/zesonixiv/eiaTgch/the_eye_coach_tennis_trainer_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xovijanovupu/ijaoibO/android_bottom_sheet_disable_drag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489601/normal_600d3908246df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_606241cb12557.pdfIn PDF document text
    • https://cdn.sqhk.co/tilesoxeg/idibjhJ/mendeley_apa_citation_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/vIhdjgI/creepypastas_skins_minecraft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_6057bc06427bd.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/asiiCkK/square_painting_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/gOhcTxs/kik_friends_apk_mods.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459035/normal_5fe0c5b6d4a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_5fea1d2061f14.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/HiiChje/30931405535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_604ade2b0e8e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_605aa9921efd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482023/normal_602acc9840e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_603025f986d1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c370a8-a0dc-473a-a82e-0e041c2ef925/jovepavozikiforabivosuxid.pdfIn PDF document text
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_eb4b1d3f9c2a46c59ff6454c691e6476.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_5b9fa9b0d26d4fc787ea26c4e4d74ab3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b33de30-35cb-4d7f-af6b-f4ee338f76a5/where_did_edward_cullen_go_in_new_moon.pdfIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_6f49ba8d65c84d1a805207c397d5451c.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_5c1a5ef4551a49219e982bcacc69c381.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_bb92b1aa91f74825b9340259753554f7.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_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 5156 bytes
SHA-256: 9f77e6a371c7953c2f48b952e8d7dc511e5925f0890615bb17f118e28b1b34de
font_01_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 10772 bytes
SHA-256: de3967850a576f6407ea9990ea7136f42de88a889dbe8a4d33c46b8e419da2cb