Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7de2ba59ca2ed7…

MALICIOUS

PDF

69.2 KB Created: 2020-12-25 00:34:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 28dae2f968f026c5cf478ddbf0ada155 SHA-1: 7972fead8d7fdfbcefe0ade0e61e5f3d49f859d3 SHA-256: 6b7de2ba59ca2ed734399b2ab283ba7ad6e99587698fc53a1dd7aa5bbbe13a35
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of a PDF link farm. One of the primary external links points to a URL associated with potential phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafftec.ru/aws?utm_term=anandamela+pdf+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5f93d3c90c39a.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/fimadurixanoj-zovider.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/3728439.pdfIn PDF document text
    • https://topagolidokade.weebly.com/uploads/1/3/4/5/134502990/4249329.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/4318659.pdfIn PDF document text
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/5373119.pdfIn PDF document text
    • https://xisotufonadate.weebly.com/uploads/1/3/5/3/135384012/8430409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417118/normal_5fb2e245448de.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/zaxawetawupo/f_sharp_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/everyone_belongs_to_everyone_else.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/dagosomivedawurisokarok.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/mixmeister_bpm_analyzer_2._0_free.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_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 5384 bytes
SHA-256: 979876eabe38fd447ef6ab9ea140506acaf82052590e521004e92a23ca6a1cc5
font_01_sfnt_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 11524 bytes
SHA-256: 09e5bbd8ecbb903e94c67a458abd51e4b6dbd06653755a09f8eb5b4b1b35bb36

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