Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e1f5cdce6bf77b…

MALICIOUS

PDF

74.0 KB Created: 2021-02-23 08:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fc4510d9aabe02224711828415aa6785 SHA-1: 2f2aaad27b03970af50929d5684590d67ff0ca10 SHA-256: a8e1f5cdce6bf77bf4a5092975e2d50cd9cfa3f5485d71539dbd5b21252c7f2e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/123?utm_term=animal+farm+online+book+chapter+1 PDF link annotation
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/kiwosinalap.pdfIn PDF document text
    • https://zakonuvuluj.weebly.com/uploads/1/3/5/9/135984705/farun_nubiz_bevin.pdfIn PDF document text
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/1296694.pdfIn PDF document text
    • https://jupimoxojufe.weebly.com/uploads/1/3/4/8/134860775/letoxegagorim_timaloxufofave_vunirid.pdfIn PDF document text
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/5758a95b.pdfIn PDF document text
    • http://itmax.info/requiem_lauren_oliver_audiobook5fk27.pdfIn PDF document text
    • http://vykupavto54.ru/cornerstones_for_community_college_success1g7ds.pdfIn PDF document text
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/6377527.pdfIn PDF document text
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/sugakenomozazone.pdfIn PDF document text
    • http://tvoyoproc.fun/1989_ford_f150_repair_manualowrdn.pdfIn PDF document text
    • http://sehq.xyz/413752879487nz5q.pdfIn PDF document text
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/4008808.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/6fe497.pdfIn PDF document text
    • http://leadtop.co/35325150298ngag6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezofavuxova.epizy.com/eternal_city_guide_storyscape.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/93198526410.pdfIn PDF document text
    • http://togalufunepobaz.rf.gd/path_dependency_theory.pdfIn PDF document text
    • http://jiwenufaxo.epizy.com/42281700766.pdfIn PDF document text
    • http://lixejezi.epizy.com/lipozotefu.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_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 5320 bytes
SHA-256: ea5a8af449709aeeeced16572c44a8fbb5d5c89b3c02f99fa791b3f679bcc77d
font_01_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 10684 bytes
SHA-256: 7a30f0f51df5f6ed02fd18b21926eca4e9ada93e67b610d1c4b41540d7ea972a

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