Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a6e718dfb907ec…

MALICIOUS

PDF

72.8 KB Created: 2021-04-20 14:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2b945ca1201edbc1745817c593a94c89 SHA-1: 66ab4bf946dc9ec32c068db6214ba317f9b0727b SHA-256: f6a6e718dfb907ec53e3df62f709368948d7fb95a9bf178f775ea20f1217ec48
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. While no scripts were extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially malicious or deceptive content.

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://xajibur.ru/strik?utm_term=what+is+descriptive+writing+in+english PDF link annotation
    • http://kizamipof.iblogger.org/motanataniz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5ff46c79aca5c.pdfIn PDF document text
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/sidogodi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412762/normal_5ff62bf6d9198.pdfIn PDF document text
    • http://fc-aromat.ru/ibps_po_online_form_fillingeyr1z.pdfIn PDF document text
    • https://wozepunelom.weebly.com/uploads/1/3/5/9/135993859/lonaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_6016435d99bc5.pdfIn PDF document text
    • http://aires.fun/we_dont_care_lyrics_the_vampsgbb5e.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/1ee64e8.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/2753046.pdfIn PDF document text
    • http://lexidubug.22web.org/melekesadifufizesekij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasetaroxakil.rf.gd/economist_nov_2020.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_13f52cbd49db4fd488aa167986e91c05.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_2034878a1b234cbcbe6b1b13aa332d00.pdf?index=trueIn PDF document text
    • http://rubigireluj.rf.gd/retepunedaluzuzofutapumi.pdfIn PDF document text
    • http://rimalapotozuf.epizy.com/47458073616.pdfIn PDF document text
    • http://gonesipida.epizy.com/56658011772.pdfIn PDF document text
    • http://durunorutap.epizy.com/fatigue_management_policy_template.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_6267c1421e7b4d55b1e995c96ddc819b.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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 5500 bytes
SHA-256: 79f3184f569c90a18b96237f584d00b3b980da772e44fc4fd4b70f1ce9215c91
font_01_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 10808 bytes
SHA-256: 8152de565acb3ba84b01e8f2395b620dc15049325af602e66bc27d4ad7632e60

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