Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cf80a5eca343d9…

MALICIOUS

PDF

65.9 KB Created: 2021-02-13 07:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: dc331ff37f88ae4f8ab1edc577083370 SHA-1: 72f8e350b673266d73772e26c65cf0002a5c394a SHA-256: e8cf80a5eca343d98d0014400c7ab01b4a845db846659b66e2ab3b8cce58d772
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=tegridy+farms+300+000+shirt PDF link annotation
    • https://vilekelapufixev.weebly.com/uploads/1/3/4/5/134508089/tajese-vipem.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/gdWCqic/download_cake_match_3_mania_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/YYsTEzB/66679718816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_5fe8396825ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_60273adc9f4de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_601855ffd0c08.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/OigmJIj/minecraft_mods_1._16._1_furniture.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5fd1813b9658d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sovagawaz.rf.gd/womugozevopoxomifeluti.pdfIn PDF document text
    • http://roworozirad.epizy.com/jigigebolumepuxodukanuv.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/yahoo_mail_app_android_review.pdfIn PDF document text
    • http://xawedanivewemis.epizy.com/small_fry_free.pdfIn PDF document text
    • http://fuxodenajakifut.epizy.com/61876427195.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_off0000c3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 5644 bytes
SHA-256: 18bd576e7c11fda4cc7c243f97020ff79ad543da87db0a94eee34d17ce392223
font_01_sfnt_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 10500 bytes
SHA-256: eee3956701d9354e70c147fde235d1cf32a3ffc4e7323c9b76a2c34b632b184b

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