Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b2f2e10701c5f8…

MALICIOUS

PDF

67.1 KB Created: 2021-03-15 16:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 340f47ac510ed417995dc3e65ad70361 SHA-1: 104f1276054c703eb85abcf833dd5e66d537b6b8 SHA-256: c5b2f2e10701c5f820f5fa867cdfdd381b75a78ffcc94896eebccba5b1e09302
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. The primary URL identified, https://kuzutuzo.ru/wix?keyword=proform+330x+treadmill+manual, is presented as a manual, which is a common lure for phishing or to direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links, including one to a potentially malicious domain (relorurexo.weebly.com), indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=proform+330x+treadmill+manual
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/809183c808cf3d.pdf
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5fda90571aa47.pdf
    • https://cdn-cms.f-static.net/uploads/4479688/normal_603a7ea5edb1a.pdf
    • http://bogipeborowe.sportsontheweb.net/what_is_the_percentage_of_food_waste.pdf
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5ff51dbac8be1.pdf
    • https://cdn-cms.f-static.net/uploads/4447646/normal_602d92a407b9c.pdf
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/kozaxepiburoj.pdf
    • https://static.s123-cdn-static.com/uploads/4394066/normal_5ffd57d5de87f.pdf
    • https://posofipijetudu.weebly.com/uploads/1/3/1/3/131380531/50d42cb2627baa.pdf
    • https://rudiduwusoxu.weebly.com/uploads/1/3/4/4/134445317/c4d6c68b1e0.pdf
    • https://cdn-cms.f-static.net/uploads/4416326/normal_60219dd60a951.pdf
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/gebawino_dipavufajobif_migufelapuxogi_wewixofadup.pdf
    • https://cdn-cms.f-static.net/uploads/4479433/normal_6019aadc9264d.pdf
    • https://cdn-cms.f-static.net/uploads/4455660/normal_603d420f613ec.pdf
    • http://dokaxirugik.medianewsonline.com/91842576228.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_4679a39495bc4945a78d95148ea79922.pdf?index=true
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_d3123799d3874db78739789d8ce01197.pdf?index=true
    • https://s3.amazonaws.com/fasomusogapovi/email_template_editor_that_supports_html_gmail.pdf
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_fbba866cd30241c3b1a323278622c0c7.pdf?index=true
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_0860fe94591e49b5b5e4d5e0fe50f8a6.pdf?index=true
    • http://nitubak.atwebpages.com/how_to_connect_fitbit_versa_lite_to_iphone_bluetooth.pdf
    • http://dasobiviwadodaj.atwebpages.com/51209233690.pdf
    • https://s3.amazonaws.com/mubemutolewe/dudiwugibe.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_off0000cb6f.bin
fc09fc3bff9693993d161f3d8d66a78fbe93bf0df25622a04cd5121cc46d5353		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 5248 bytes
font_01_sfnt_off0000dd3c.bin
c182007bdf78dc36497520ea14a8a7209723c538aebe87c907ca1bbb0ba5711e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 9964 bytes

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