Malicious PDF — malware analysis report

Static analysis result for SHA-256 387fbecdaace0fa8…

MALICIOUS

PDF

70.6 KB Created: 2020-11-19 07:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31b4c3cd0cd5570fd6e0c8396adf2cea SHA-1: dc505bf6bc879bc58bc0efed9ce4c98c2fc2e129 SHA-256: 387fbecdaace0fa8f968f37286e265c17675904d37f1b6a951105620ddec8c8f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'traffset.ru', suggests the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to manipulate search engine results or host malicious content, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=beyblade+burst+mod+apk+android+1
    • https://vefubonipit.weebly.com/uploads/1/3/4/7/134719522/mixokuginizinewa.pdf
    • https://cdn-cms.f-static.net/uploads/4388406/normal_5fadac69a7ad4.pdf
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/16a8e8ab89d.pdf
    • https://topagagi.weebly.com/uploads/1/3/4/3/134337746/pexifuvudosigip.pdf
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/476272.pdf
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/447393.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zasepo/fumikudojipoxejutej.pdf
    • https://s3.amazonaws.com/woxorojero/5949772311.pdf
    • https://s3.amazonaws.com/napisakaluja/99126907544.pdf
    • https://s3.amazonaws.com/muvemasoxaji/calendario_rusia_2018_descargar.pdf
    • https://s3.amazonaws.com/gotenukevepunin/alabama_bill_of_sale_for_vehicle_template.pdf
    • https://uploads.strikinglycdn.com/files/fff15f6b-81cd-4af2-a61f-c1cf943a8a93/5243259289.pdf
    • https://s3.amazonaws.com/bulolimepol/57328961427.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_off0000c8e2.bin
ad591b4a617974ecb04dec7112502e7107c281ed72b702680f38521aba423da7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E2 5512 bytes
font_01_sfnt_off0000db8e.bin
bbc07733bf115aebbe00ababdb49296b77ac6f9175179bceda15697507e2283f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 15560 bytes