Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acb89a5e29a7db7…

MALICIOUS

PDF

92.9 KB Created: 2021-03-22 14:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 832cb4638b4c6ce11a24fd23fc150b5b SHA-1: 7c5c98d57231156daeafa2de5defa640c20fb55d SHA-256: 3acb89a5e29a7db7ecfea3523ed65d3983bca910378244004b6408feea9224e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, with one prominent URL pointing to a suspicious domain, suggesting a phishing or link-farming attempt. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=development+across+the+lifespan+7th+edition+ebook
    • https://static.s123-cdn-static.com/uploads/4369630/normal_5feef1822cad4.pdf
    • https://cdn-cms.f-static.net/uploads/4391008/normal_6044fe93a4d08.pdf
    • https://cdn-cms.f-static.net/uploads/4382189/normal_600d24d7a153b.pdf
    • https://static.s123-cdn-static.com/uploads/4420476/normal_5fcea5ac86b9d.pdf
    • https://static.s123-cdn-static.com/uploads/4408335/normal_5ffa72237f830.pdf
    • https://cdn-cms.f-static.net/uploads/4415767/normal_601dcc18c412c.pdf
    • https://cdn-cms.f-static.net/uploads/4474449/normal_60387a03dae2e.pdf
    • https://cdn-cms.f-static.net/uploads/4386595/normal_601a3be96d6f6.pdf
    • http://lamanixumerad.mypressonline.com/xepipojuxisefo.pdf
    • https://cdn-cms.f-static.net/uploads/4498997/normal_6033c0f1da822.pdf
    • https://static.s123-cdn-static.com/uploads/4460972/normal_6003dae37d136.pdf
    • https://cdn-cms.f-static.net/uploads/4393204/normal_6028e3d15345b.pdf
    • https://cdn-cms.f-static.net/uploads/4487191/normal_603c37bcb067b.pdf
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fd654e568c4a.pdf
    • https://cdn-cms.f-static.net/uploads/4403565/normal_5fd7da852d067.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/562ad8cc-2f2f-4925-b129-460748ae01e1/63119687778.pdf
    • https://uploads.strikinglycdn.com/files/92753973-79d7-4ef0-b599-a4e0dda451d9/how_to_recondition_a_dead_phone_battery.pdf
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_5a0738aed44b42bdb98dac183dfc1c52.pdf?index=true
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_0bdd233fa3cc47758b3ce2ce407f7d0c.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_8561a50578584b959820ee036c32bbc9.pdf?index=true
    • http://zowofiz.myartsonline.com/56978911560.pdf
    • https://uploads.strikinglycdn.com/files/23cb6bff-c50e-4284-bcf6-403187271c77/posazepigododefolidaxubeb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bed.bin
549def798a6e4952de85520924a455d55ecf2972a9800910f3559dbbcd2d891b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BED 5740 bytes
font_01_sfnt_off00013f53.bin
c39066bb5e0193b4c1c294872768fd7f6560695577a37994bd8e476aefe5f8c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F53 11412 bytes

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