Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae36da915eb3b62b…

MALICIOUS

PDF

71.2 KB Created: 2021-01-03 11:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3706d33a1b77f6124d25af3da2625590 SHA-1: 437423078a1a5269445c5c73fc9790c7ede1bb02 SHA-256: ae36da915eb3b62b9d82dd77f80129e6bbc3ec8bd421ca3d748677a1c63c92c5
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'Assassin's Creed Revelations Android Full', likely a lure to entice clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/aws?utm_term=assassin%2527+s+creed+revelations+android+full PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455902/normal_5fe53ecc5bb56.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/TMXiap8/money_maker_strain_hunters_seedfinder.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/vagatixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403681/normal_5fc3e22b8110d.pdfIn PDF document text
    • https://tevuvusit.weebly.com/uploads/1/3/4/3/134373155/6790480.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/0825c23c53a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f92ac4167674.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/P3ggGXX/happy_birthday_brother.pdfIn PDF document text
    • https://soduwojipanaku.weebly.com/uploads/1/3/4/8/134865762/8803995.pdfIn PDF document text
    • https://xoragawamu.weebly.com/uploads/1/3/4/6/134666694/763ee.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/1375884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f926e4f713e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385206/normal_5fc9818070f94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 5096 bytes
SHA-256: 1bf111f4ac87a0edbe77ecdc92a57d0badc0126fe504d180497d7a3f09141b3d
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 11492 bytes
SHA-256: f4758d77ab58394f123b0bf0a793b6aa3876f7195ff0197e8ebe267343d5b030

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