Malicious PDF — malware analysis report

Static analysis result for SHA-256 6117088a31a3621a…

MALICIOUS

PDF

77.0 KB Created: 2021-06-05 13:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfe7571409d50969353e26ac455a6f48 SHA-1: a50326cbbb00b07df630d55755f1026f0ff928f3 SHA-256: 6117088a31a3621ac30bd1464fdcc1bba1e31aa6abeb106396c421a0f18a3a5b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document's primary purpose is to host numerous external links, likely to facilitate phishing or distribute further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to potentially harmful external sites.

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://crysiq.ru/pbw?utm_term=pseudo+clementine+recognitions+pdf
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/591158.pdf
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5fd389be3558a.pdf
    • https://lamekibig.weebly.com/uploads/1/3/4/6/134652122/459315.pdf
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5fdd0b729b5f3.pdf
    • https://cdn-cms.f-static.net/uploads/4412377/normal_60443ddee105c.pdf
    • https://gozajajemitala.weebly.com/uploads/1/3/4/3/134325553/variloxeva-delekupajevuk-ruwonovesa-visaf.pdf
    • https://tunajixawovu.weebly.com/uploads/1/3/0/8/130873758/ee13cd22.pdf
    • https://cdn-cms.f-static.net/uploads/4501634/normal_605bde5055dee.pdf
    • https://cdn-cms.f-static.net/uploads/4466661/normal_604b19afac9a5.pdf
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/kunizogiserina.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/953253ba-5fa4-4d3e-a459-55f7331f9c92/121130125.pdf
    • https://uploads.strikinglycdn.com/files/1e143667-de18-4c29-a5e8-3e6a5746cb48/kakurunevimozitujususe.pdf
    • https://uploads.strikinglycdn.com/files/29063532-f88f-4a82-a232-ea7aea530bf3/225757333.pdf
    • http://jutopar.pbworks.com/f/dilunikum.pdf
    • http://zubipuwaf.pbworks.com/w/file/fetch/144510273/how_much_should_i_pay_for_a_husky_puppy.pdf
    • https://uploads.strikinglycdn.com/files/241a7756-3014-4120-898f-6990b51c2199/sidebuzilikogepunubev.pdf
    • https://uploads.strikinglycdn.com/files/0e715845-cb80-4300-b218-91fb39633fab/85287420104.pdf
    • https://uploads.strikinglycdn.com/files/7acc4de9-5737-460e-9389-a4a4681a0de0/96171638806.pdf
    • http://pinurakus.pbworks.com/f/naming_compounds_containing_polyatomic_ions_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/8d81485f-000c-4299-aba2-cd405d8c217a/xuxivovokojilezedupanaf.pdf
    • http://zewalar.pbworks.com/f/46784319507.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_off0000ee16.bin
c721769786a4a9d03fb8669eb2ec95ce8b6cf898e0678f1274fb7a2324c85408
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 5264 bytes
font_01_sfnt_off0000ffec.bin
22da42a85b6c8effa9352bf378e18da444720f8e0ec7e216f16aedcb04dfe3ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 11332 bytes