Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8b0432d707bcc8…

MALICIOUS

PDF

65.0 KB Created: 2020-11-26 04:02:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a9f20c302fdd91e3bdc40923bc8a978b SHA-1: 13b20f96f836958cf8b8c815245eee29c642619b SHA-256: 1b8b0432d707bcc85126eef74065cee23be658defd937a90f040f2a96e786cce
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://trafffi.ru/strik?utm_term=aaa+auto+loan+calculator', suggests a phishing or scam attempt disguised as a financial tool. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=aaa+auto+loan+calculator PDF link annotation
    • https://sitawixabebel.weebly.com/uploads/1/3/4/3/134319036/3241887.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/vimimijidife.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/002270ba-1bfc-4594-97bd-0e3a73735fa8/read_daniel_x_watch_the_skies_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae37a29-4a1f-4fa2-a484-0463f7be5ef1/18833114999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af3a70d-6ce2-4d59-bde7-d9671716f5ba/wukogelumabamatusesitoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d237db4f-d293-4c43-9d00-1d181b64b4db/40779780639.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/power_to_power_rule_exponents_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/38671196678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd0b5ed-c0db-4f90-adc9-211b0e3501dd/zebef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b9c2fa-0be2-49f3-ba5d-362071538723/12864828498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f5862e-2e11-4c49-9041-f2130146a6ee/wubuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4749d5e8-9763-4e31-b1f4-601f5c20dde0/4587044487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8279338b-210e-4abe-af51-dfa19d17807c/20304275199.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42A 4604 bytes
SHA-256: 97e64457d00214dfe64fe5fe1ffeb71eca8375a3cd89c6b3ebdd4b19827de9df
font_01_sfnt_off0000d3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 10472 bytes
SHA-256: 2a4c4df394489cdba5df0f8127a5131ddce9bfae3c1bd2177bc070aa3f09d125

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