Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a00501901dec4d…

MALICIOUS

PDF

62.8 KB Created: 2020-12-18 23:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 96681535042094a28aa8875adc6ba3a8 SHA-1: e05fbbf9967883eaf4ebdc4eec26a18d704615bb SHA-256: 51a00501901dec4da26f55d2500189857178d79847c6ad44c416498ee6040937
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to redirectors and SEO link farms, indicating a phishing or malware distribution attempt. The primary redirector URL, 'https://traffset.ru/strik?utm_term=convert+a+volume+of+1.75+in3+to+cm3', is used to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/strik?utm_term=convert+a+volume+of+1.75+in3+to+cm3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461207/normal_5fd83a659ca90.pdfIn PDF document text
    • https://mivijupa.weebly.com/uploads/1/3/4/5/134578330/fawusuvesapezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463785/normal_5fc38a509fb7a.pdfIn PDF document text
    • https://didowivukosu.weebly.com/uploads/1/3/4/4/134470318/bodapirufisawebimax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_5fd17b4050072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/156c5d19-cd51-4c7b-b274-5bffa7d27dd1/vapibonivemagaroral.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/73604263902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0845b9dd-467d-4bd8-8213-29e21a6e9a95/spyderco_endura_4_vg10.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/44556261685.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/fedejod.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/boomsday_puzzle_lab_guide_survival.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA3 5264 bytes
SHA-256: fe9454eb50fb6bc904de0994f747ac2be5468501ad79e45024a6c6b7e35bfd23
font_01_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 10004 bytes
SHA-256: 75b77579a43d463807cf3d97af7bacc28a4933ad8225fc714dafd23b0843a1ec

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