Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dc2d7433945a4c…

MALICIOUS

PDF

115.0 KB Created: 2021-03-25 07:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5007d6286238db7ab6b343166f46fcfc SHA-1: f2f69fa2dc627f6aebd654cfe3da01c38a29de24 SHA-256: b9dc2d7433945a4cbc58879216c2c0597b32e7a5dad76d5cf81aa111f24141a8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://jumiwimov.ru/123?utm_term=manual+geografie+clasa+5+cd+press', appears to be a primary lure. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt.

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://jumiwimov.ru/123?utm_term=manual+geografie+clasa+5+cd+press PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376856/normal_6048e9dd5c174.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/bZuigN9/lokawivezuvigus.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/8a0b81b94.pdfIn PDF document text
    • https://sijotifibiga.weebly.com/uploads/1/3/0/9/130969940/39e6f54062f20.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/0gjdhia/brackets_free_for_windows_7.pdfIn PDF document text
    • https://dafebifu.weebly.com/uploads/1/3/4/3/134399244/wavowaje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403541/normal_5fe02d47f33f6.pdfIn PDF document text
    • https://zudepiguzow.weebly.com/uploads/1/3/4/7/134774383/5084349.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ihEjihh/lebara_mobile_deals_uk.pdfIn PDF document text
    • https://terokusaf.weebly.com/uploads/1/3/5/3/135347070/3382236.pdfIn PDF document text
    • https://juxipibofo.weebly.com/uploads/1/3/5/9/135985723/38804ed45.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/hii52oY/73703168735.pdfIn PDF document text
    • https://bemujegifa.weebly.com/uploads/1/3/5/3/135312506/kezuvasidakidogu.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/hfAehhY/globe_rewards_list_call_to_other_network.pdfIn PDF document text
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/4f69fe8500054d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00018035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18035 5452 bytes
SHA-256: 9e816872bc9876bf5bd0f151a4db02628287aa55fafaf96edcf5cf0a02a6adaa
font_01_sfnt_off000192e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192E6 13864 bytes
SHA-256: f5f1fbee4c80cc510159041ea832c883a7dae04f348ecdb17472c76c3254cd2e

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