Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c04812dc458444d…

MALICIOUS

PDF

77.0 KB Created: 2021-06-05 19:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f2170f93f76554fadf3f061167814feb SHA-1: 235698475b846ab0fab42b64d34539b1e3fe9da7 SHA-256: 5c04812dc458444dc0faf8042a602b3bbc2765c0300cec7c5aefd0be9dbe81a0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing pages or further malware downloads. The heuristic PDF_SEO_LINK_FARM specifically highlights the presence of a large number of external links within a small PDF, suggesting a coordinated effort to distribute malicious content.

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://crewmak.ru/pbw?utm_term=d%2526d+5e+player%2527s+handbook+color+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499329/normal_60043b0863f68.pdfIn PDF document text
    • https://kugibiredatejag.weebly.com/uploads/1/3/4/3/134319346/jutin_movapu_rixezisuripawob.pdfIn PDF document text
    • https://navitadewota.weebly.com/uploads/1/3/4/0/134017874/zapobedevapuxalisob.pdfIn PDF document text
    • https://guwemegarorara.weebly.com/uploads/1/3/4/3/134353603/jewid-ponafewoserotup-pakiba-zinuju.pdfIn PDF document text
    • https://waraxisunagigam.weebly.com/uploads/1/3/4/1/134131416/pepalol.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/ca8e4a48c06cde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_5fe91d59b7e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_602031b2793d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422144/normal_5fcddc456fdab.pdfIn PDF document text
    • https://limumowitizuwag.weebly.com/uploads/1/3/4/5/134587832/kiwexevo.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4500450/normal_60b08c47d20ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_60115e2c266fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144447330/normas_aduaneras_de_cuba_2021.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144433845/bestway_12_foot_pool_manual.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/w/file/fetch/144629166/modsy_design_packages.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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 4156 bytes
SHA-256: 9253c4ec90eb8b217ae91b3aef6412788d3d1419415539c5cfb70110cf842fd1
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 13144 bytes
SHA-256: b630be0e1efc86cfa773f4bbe5df3ab11065a8fbd9e03cc8dd67cfba596dfc4b

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