Malicious PDF — malware analysis report

Static analysis result for SHA-256 12313f433ce1afd8…

MALICIOUS

PDF

76.0 KB Created: 2021-05-12 21:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e86e5bbeb9560eafb60f30ed373e74f8 SHA-1: bf667655a6a0caba8556caee688d395da758634c SHA-256: 12313f433ce1afd80f9c29dbb57007da2dc12f997727de7778acbc17f71699fb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to a suspicious domain that appears to be part of a link farm. The heuristic PDF_SEO_LINK_FARM indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://soxebez.ru/strik?utm_term=john+deere+316+lawn+tractor+parts
    • https://cdn-cms.f-static.net/uploads/4426260/normal_5fdbe6f758a39.pdf
    • http://bonus332.site/koniwavefudasuxutaliwesislzmwh.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_604a6b27c2454.pdf
    • https://cdn-cms.f-static.net/uploads/4469831/normal_6069841f80b77.pdf
    • https://cdn-cms.f-static.net/uploads/4486522/normal_60611fb6a1bc8.pdf
    • https://cdn-cms.f-static.net/uploads/4446289/normal_602305f618d0a.pdf
    • http://keto-menu.online/13826778978423lt.pdf
    • http://doordash.fun/79965226274rmlnt.pdf
    • https://static.s123-cdn-static.com/uploads/4370088/normal_5fcea7e0c056b.pdf
    • http://pasendapp.online/32239792245fov2k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_f71e977a953f40c39e58176437d68854.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7494677c-2ac7-44b1-84f4-909d986c816f/congress_plan_for_reconstruction_after_the_civil_war.pdf
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_c64af9d28af8404faa2de127db3829da.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c490c598-3959-4f25-a833-8953f74e5002/rugaxurukama.pdf
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_ae378654d46d46769702da8117cf9eb1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c80f94ad-2372-4a51-8bc2-5fb8ae7adfb0/roadmaster_bike_parts.pdf
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_0ad2d748f86142ac981786c91170b8ab.pdf?index=true
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_1036b6d199a643e9ad2647490b0e57f1.pdf?index=true
    • 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_off0000ea2f.bin
242859f9adbf874332eb9c4de9896aaf7b6a14e9a91d90778b7a12d8c33315db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 5612 bytes
font_01_sfnt_off0000fd5a.bin
869524b426661a73776c23fb94415ff72163b85850033be0eeae4381b88fc9bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 10992 bytes

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