Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7aa398fcde26e8…

MALICIOUS

PDF

75.9 KB Created: 2021-04-04 18:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a0b2c1723934766f590669ecdeddf357 SHA-1: de4afc96a5cf94f264d5006fc39ad49bfbb5164c SHA-256: 2c7aa398fcde26e872c584b16cbb72240f1f5755f38ffccbee3d4e55474e1dd9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://fokemale.ru/strik?utm_term=the+yearling+restaurant+sour+orange+pie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385235/normal_600dd367803dd.pdfIn PDF document text
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/a904148c95.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/1zr25ki/guide_for_super_mario_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ff8fc8b8cffa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366377/normal_5fe2ab30dc212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_604d2c5d08e79.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/gLUqejd/anger_of_stick_5_zombie_coupons.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/che4ifb/66640346075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_600301351d8ed.pdfIn PDF document text
    • https://xalovediluf.weebly.com/uploads/1/3/1/3/131380345/zewefidononaxajumas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413590/normal_600176c04b6b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_601f31522361c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_604af32b919a9.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/1743915.pdfIn PDF document text
    • https://pamokevavazodo.weebly.com/uploads/1/3/4/3/134386981/268767.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/778cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_60405e722155f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_60103146d58e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_602e22121959b.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/d64f52dd-26cc-4d48-af47-a6eb1252a745/plot_2d_graph_mathematica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8714c2eb-f669-4e2c-96a1-556505ab1305/60354439399.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_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 5132 bytes
SHA-256: bb07781e22fb3cb66e8d9400bbf4958f685a4e954241fedc2586a07bc8a2c276
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 11392 bytes
SHA-256: dfa53ccfd0ce57cd2d0ef00ba987e338c21ea9c5e691dbc057eb042ebe71d715

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