Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd6d6f85661a452…

MALICIOUS

PDF

74.1 KB Created: 2021-01-11 22:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 48993946c60eacc707a986b0d6036a47 SHA-1: 21a1fe90529f270b8c80f59b986aa20bd6f58b2e SHA-256: dcd6d6f85661a4525186138640bb3aafc1081d2774f5007ed28d31841c346a7e
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious document, possibly exploiting PDF vulnerabilities or using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://trafficel.ru/aws?utm_term=bollywood+movie+2019++site PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450638/normal_5fb41ba930438.pdfIn PDF document text
    • https://site-1174029.mozfiles.com/files/1174029/ropoki.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/lajovipo-nupopeva.pdfIn PDF document text
    • https://site-1172627.mozfiles.com/files/1172627/vexobixolemitakanamab.pdfIn PDF document text
    • https://site-1166620.mozfiles.com/files/1166620/vuvusiwifugunulijituxe.pdfIn PDF document text
    • https://site-1178372.mozfiles.com/files/1178372/22803150296.pdfIn PDF document text
    • https://biwewijusegi.weebly.com/uploads/1/3/4/5/134586848/fimefujinedo-podanevazosene-lubuwa-zusixodo.pdfIn PDF document text
    • https://site-1175279.mozfiles.com/files/1175279/mudamavajepodavogufig.pdfIn PDF document text
    • https://site-1223352.mozfiles.com/files/1223352/46083257154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5f8bf7d6ad4be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daselex/xemujikilizugegizisekat.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/zovawaxipumuju.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/zawuponojosidazimivupisig.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_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 5448 bytes
SHA-256: d2ae981c53497c59fb8f5ed7f40622821fe6c182dfe9586aaa0a7518e75d1fa4
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 10648 bytes
SHA-256: 8e53531b2dcad0ca0a67967bad289139bbfcfedde27513c2cf4c22daf29c0e30

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