Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09719de8fdbbce2…

MALICIOUS

PDF

77.1 KB Created: 2021-04-06 12:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 24159b435e3d66122139949acdc42195 SHA-1: 6750dcd0587b4b03995721bd209151b650da78f4 SHA-256: f09719de8fdbbce2fd01b9c949b7858981c0fe75b469415356bc764730918513
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, including one pointing to 'dugedepap.ru', suggesting a phishing or spamming campaign. The document body, though heavily obfuscated, appears to be a lure related to 'work performance evaluation template'. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://dugedepap.ru/123?utm_term=work+performance+evaluation+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495034/normal_606561bed34fa.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/giibged/plastic_animation_paper_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/bXhjovB/ropep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5fe60d638e3e4.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/xZhfiem/alan_walker_beats_piano_tiles_dj_mod_apk.pdfIn PDF document text
    • https://dazifefizax.weebly.com/uploads/1/3/4/8/134854215/1fbf5.pdfIn PDF document text
    • https://garepogive.weebly.com/uploads/1/3/4/8/134871831/9158f40143b19cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_6023d22079068.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/bo1giFm/tank_traffic_racer_2.pdfIn PDF document text
    • http://tadukesavexufe.22web.org/kamapevamotudefi.pdfIn PDF document text
    • http://guvinesusavilo.iblogger.org/scope_document_template_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_5fd23ae523f51.pdfIn PDF document text
    • http://zesonel.22web.org/26585528544.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/1gi7jcR/89964010378.pdfIn PDF document text
    • http://jotetimaral.22web.org/gonajupepilu.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/gciIjd0/94957159343.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/tabobujimo/39187338560.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/dodegokolurusugedasexajo.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5120 bytes
SHA-256: 0c00282e0bcac61b765c2ac632a15a5c453e9bb251ede39d33baf406dbb76a7d
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10856 bytes
SHA-256: 5422b8af86e34226462b5bbf3fa29922e81633c618b17ceb02cf0566371f8e48

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