Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b9f3b47909e2f1…

MALICIOUS

PDF

77.5 KB Created: 2020-11-14 14:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: df5933b77b1f1bfe1b3994198f96d7fb SHA-1: d94e34fc600b7966fdc8591d5ad80db58ca346fc SHA-256: 48b9f3b47909e2f1140e276e0b6eb5c12a4c9d4f41d3ecd186e1627049a4fc2c
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1059.007 JavaScript T1204.002 Malicious Link

The PDF file exhibits characteristics of a phishing attack, specifically impersonating Amazon to trick users into providing credentials. It contains a "mass external PDF link farm" and uses urgency lures, indicating a malicious intent to deceive. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bofufawikifof.weebly.com/uploads/1/3/4/2/134235483/dutajakirow.pdf.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=system+security+plan+example PDF link annotation
    • https://bofufawikifof.weebly.com/uploads/1/3/4/2/134235483/dutajakirow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5f94cb4093a86.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/rotujajixaw-rugarim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f93c0104cd89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_5fae8d971e558.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/7d5d6eff-3888-4976-afc5-cefd4b0bd540/jebaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68af6b3-73cb-4576-90a2-d4bf73925025/7850740856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd0845b-a51b-4ad0-86c8-8274283f0b01/66476328009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43dc71c2-3f32-43de-ada9-7abe419af2a9/rusozakesid.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_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 5352 bytes
SHA-256: 5c6dca4bee58597d946f804d3eb04978979b8eb45ff8333c4a6ffa70567a0864
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 10080 bytes
SHA-256: de47deed897fc83bd66077759633b1f54df744c0847e45b92f95b975bde0b233

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