Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0a5678d1eb3ae4…

MALICIOUS

PDF

82.3 KB Created: 2021-04-17 10:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c40dfde89c611db5abbc8e037a5fe80 SHA-1: ecde994f7524474ce8c76e2187e8ccdb1f1b0bd4 SHA-256: 6b0a5678d1eb3ae4908ba14635e6d36b28e73f5ae5329c52db05220b7d479853
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable domains or Weebly hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=how+to+put+a+hard+return+in+an+excel+cell
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/afeb9cdedd2.pdf
    • https://wesatelifap.weebly.com/uploads/1/3/1/8/131871597/758095.pdf
    • https://static.s123-cdn-static.com/uploads/4452152/normal_5fcae6d251204.pdf
    • https://mulononar.weebly.com/uploads/1/3/5/9/135959518/d18d18470fd7b.pdf
    • https://batebabegusuk.weebly.com/uploads/1/3/1/4/131437625/debusujipid.pdf
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5fe38777d3db2.pdf
    • https://vupixesit.weebly.com/uploads/1/3/2/7/132740805/ziximezixopew.pdf
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5ffec499c4062.pdf
    • https://static.s123-cdn-static.com/uploads/4481828/normal_5fdf56697e719.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_eb981ab4b9a94409b9cc18de31a368e6.pdf?index=true
    • https://s3.amazonaws.com/nelizenejakarug/bhakta_tukaram_songs_telugu.pdf
    • https://s3.amazonaws.com/tetenifeme/explode_the_code_books.pdf
    • http://gilebufamefaf.rf.gd/madama_sui_augusto_roa_bastos.pdf
    • http://mebukaronov.epizy.com/venture_capital_funding_rounds.pdf
    • http://pixewinodak.epizy.com/zoology_practical_class_12.pdf
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_db2aa8c3104e40d68b1cdd9bf9c7e1f0.pdf?index=true
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_a0bc8c2e0dfa48b6b215ca3bfe13f5a7.pdf?index=true
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_a325c0e2c2d04fd0af56462606d88c10.pdf?index=true
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_b945c988fbbf456b8350f73f6a2aa5cb.pdf?index=true
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_cb25e8fbf5e649acb52bc4881adc4323.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78a.bin
84990c3d88cd4aff57d5801421baea4b246b5211d42f26ae8ac4116aaaade639		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 4988 bytes
font_01_sfnt_off00010883.bin
ba347af24f7b4080229b938478c7bf919a6e6f315e3637255e70ea16a1b064e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 10888 bytes
font_02_sfnt_off00012db8.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 4324 bytes

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