Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2f462ee5ebde76…

MALICIOUS

PDF

76.1 KB Created: 2021-04-16 12:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b7b0e57d0261a81d20e0cacb1f883353 SHA-1: ab2c29f866e688746d186598fc56c122a3dfdbc0 SHA-256: 0e2f462ee5ebde76c06fe84c25896a28d861893b744b06ad483ad0979164afdb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external URLs is the primary indicator of malicious activity.

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/strik?utm_term=what+is+misprision+of+treason PDF link annotation
    • https://wodosokereso.weebly.com/uploads/1/3/1/4/131407547/c86b18e99e.pdfIn PDF document text
    • https://pijusutuwo.weebly.com/uploads/1/3/1/4/131407307/1590747.pdfIn PDF document text
    • https://zuzunavodezap.weebly.com/uploads/1/3/0/7/130776081/e0ee8cc58c832.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/adobe_pro.pdfIn PDF document text
    • http://segakibosuvi.22web.org/unix_bash_shell_for_windows.pdfIn PDF document text
    • http://stepka2016.xyz/pirerugetebuvoloxj0rdj.pdfIn PDF document text
    • http://apple-fruit.space/tegegojeses1u3mo.pdfIn PDF document text
    • http://nuzidixiwetor.22web.org/kiwodalemozomez.pdfIn PDF document text
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/penigirevaxadibiv.pdfIn PDF document text
    • http://ganutaragifak.22web.org/cambridge_english_fun_for_starters.pdfIn PDF document text
    • http://kokusurajiguz.22web.org/wegowebunegovalo.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/xozapasuxed-vasatunobat.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/angular_contact_ball_bearing_skf.pdfIn PDF document text
    • https://moturepuka.weebly.com/uploads/1/3/1/8/131871952/3a19e0.pdfIn PDF document text
    • http://banuduxirodeb.mypressonline.com/rubaguripomudipufejaxixu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josegofubusem.epizy.com/63630129842.pdfIn PDF document text
    • http://sojusubelifaf.epizy.com/bracket_latest_music_video.pdfIn PDF document text
    • http://wobemiko.epizy.com/69380223758.pdfIn PDF document text
    • http://lurosanonit.epizy.com/vafipisuwegidupufuloka.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_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 5120 bytes
SHA-256: 30269942a897906149a62a518052d82cb31ca3fcf137209fc32fab133d0fb499
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10796 bytes
SHA-256: cfd506c20579f11761c0d751c4b06891b0a64fa5c5f691693aa980bb90d3442d

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