Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7d0c3c5aed3e34…

MALICIOUS

PDF

84.6 KB Created: 2021-03-02 17:34:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 24da4248baa886b04555d123e22e52c4 SHA-1: de5f1b22b447e82b2403671e0488746e3c5af3c7 SHA-256: 8f7d0c3c5aed3e346f0e99d426a7899938f3038394c07bd8b23cb294e2accaed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://jumiwimov.ru/123?utm_term=c4elink+music+appreciation+final+exam PDF link annotation
    • https://tugemizibu.weebly.com/uploads/1/3/0/7/130739278/dae8d.pdfIn PDF document text
    • https://zolulosix.weebly.com/uploads/1/3/3/9/133986826/806755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418777/normal_5ffd2468b34e6.pdfIn PDF document text
    • https://feselezoretun.weebly.com/uploads/1/3/4/6/134690260/fifatezotugi-gixoxixoxiv.pdfIn PDF document text
    • http://freedate18.xyz/88263995291ahb2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_602037f53d45b.pdfIn PDF document text
    • https://jumojebanofoz.weebly.com/uploads/1/3/5/3/135302369/xawomimegabonobi.pdfIn PDF document text
    • http://femofuwodirunik.22web.org/66834855717.pdfIn PDF document text
    • http://ing-cliente.com/noxuzupixasakepiroxisaxwab.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/niwotipugonuvoz/12627776301.pdfIn PDF document text
    • http://bexawiturefu.epizy.com/69669775338.pdfIn PDF document text
    • http://maguvotu.rf.gd/self_certification_form.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/cydia_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/what_do_amazon_operations_managers_do.pdfIn PDF document text
    • http://karatufi.epizy.com/5285455575.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_off00010f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 5288 bytes
SHA-256: 4b23f23179ab9bca2e2d45eb3177f07fe0573839928fd0d31942670eb682902f
font_01_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 10400 bytes
SHA-256: 4c35f28aa8cab0159018951df1142ea32ac98ff7d1755767898c7a2e82ddc2ac

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