Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed27bff14194849…

MALICIOUS

PDF

72.6 KB Created: 2021-04-02 02:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 12d6ec86ef1db6d85155199bb46eec4c SHA-1: 767d40991423270ea9be78258d13a18580cfafa4 SHA-256: aed27bff14194849da4636f038f8691c082b28fa17dafcf4a6ca53422c64e777
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique commonly used in link farm attacks to generate traffic or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a phishing or malware distribution scheme, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=pdf+file+convert+to+jpeg PDF link annotation
    • https://cdn.sqhk.co/savunowudob/kieozyO/togilimewori.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/xegod.pdfIn PDF document text
    • https://cdn.sqhk.co/belexewuwif/hgjd3tP/7_rings_lyrics_without_bad_words.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/ghNjjOE/78743939183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_601ed72aa8f0f.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/bjcidgf/facebook_lite_apk_latest_version_uptodown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fcaeb8f4807a.pdfIn PDF document text
    • https://wavadubo.weebly.com/uploads/1/3/0/7/130775728/womudalakepa-vozazozom.pdfIn PDF document text
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/dirovapibojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394061/normal_5fed3f15f166c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_604318cbcab89.pdfIn PDF document text
    • https://cdn.sqhk.co/rasidepad/HgfxRQD/julidizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_f75ae949f00e443993a7954c8e877e37.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_ef0f6d2f791f4b5797c1d3c155f6762b.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_23646115082641a28b22ba5dd198e623.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_00b32229a03d42a8a55370611f8839dd.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_c649234cd8594be3b15093e868290748.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_2b43ffb5973c481f9de5b523403ddd7d.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_fb868be276ef487f97181faeecd72bac.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_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 5072 bytes
SHA-256: 4daf7461b1535e71ad7cf2e5994ac0c7151c8b9a8744e76c2919c4f17ef53cac
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10468 bytes
SHA-256: bc7f56f036940c06b8ab769349f88912aaf22d4ba688c12bb66a04e88e938e3e

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