Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac737faf761a4bbb…

MALICIOUS

PDF

69.7 KB Created: 2021-02-06 04:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 32882b2ea88069538fca7104fa614580 SHA-1: e4361d7512fb79ef3a225c390c68b1ca80d63fc2 SHA-256: ac737faf761a4bbb0c80a5b9c33c03f4c2b268a8337b084b17a8d97d5f19be83
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The embedded URLs suggest a potential distribution mechanism for further malicious content or phishing attempts.

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://seumenha.ru/123?utm_term=flight+of+the+conchords+seagull+t+shirt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369332/normal_601bdd43b5e55.pdfIn PDF document text
    • https://wuxuvekukiku.weebly.com/uploads/1/3/1/3/131380251/rijix-serevidupo-motovulijirome-gowumiso.pdfIn PDF document text
    • https://kufobuzu.weebly.com/uploads/1/3/5/3/135330794/4384342.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/9903233.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/735022.pdfIn PDF document text
    • https://pekizexigobuton.weebly.com/uploads/1/3/0/8/130815014/rumajurur-fevewirujofono-kedelibafe-diwak.pdfIn PDF document text
    • https://wefigoga.weebly.com/uploads/1/3/4/0/134041661/3189911.pdfIn PDF document text
    • https://pekiwuvigefarov.weebly.com/uploads/1/3/4/7/134766825/zuzatutuxos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478148/normal_5ffac28cc0056.pdfIn PDF document text
    • http://ximikilanad.22web.org/holika_holika_pearl_sheet_mask.pdfIn PDF document text
    • http://mkuu.club/771015252g9bsu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446937/normal_5fff11e653239.pdfIn PDF document text
    • http://suxiselukex.66ghz.com/wixisomajob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_5fd33e92ea821.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulonikolevezof.epizy.com/58463640857.pdfIn PDF document text
    • http://wabupotobexuxu.epizy.com/sotukumuriwebedekagu.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_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 5236 bytes
SHA-256: 2eeaadcbf2e83adfb9956d31ac5bcc96168aa2fb22ecb1b0e55dfffc0e09463a
font_01_sfnt_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 11288 bytes
SHA-256: 3e35652cbeb65d6e08cd475176d4f4b682c65930f65a6c0983888e042ae0dd0e

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