Malicious PDF — malware analysis report

Static analysis result for SHA-256 d983f255a21cfa47…

MALICIOUS

PDF

62.5 KB Created: 2020-11-23 20:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f66c2dbb15f18179b794b0ced9fd33d8 SHA-1: 2d252ec8e4bea7e950ca8abd3ce8ee304924e07d SHA-256: d983f255a21cfa4755e4febd62606ffb94165227cb1327aa1ed1e3a19918c600
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?utm_term=chu+dai+bi+tieng+phan+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5f9c3ebbb921e.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/vofezonusojejox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_5fa3a22f7e7a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_5fb38acb4f046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482629/normal_5fa8961ab69b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f916344569c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5f9beaf68712f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5fa6a0a8b8e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_5fa8be0d796c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/firudegix/fazis.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/symbolism_of_fire_in_lord_of_the_flies.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/baby_yukio_blue_exorcist.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_off0000b81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81F 5276 bytes
SHA-256: 865f23261719caae9f98ba0fe33946954d7da121b25d11b971662ca48cad0e2f
font_01_sfnt_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 10836 bytes
SHA-256: 9f419aca0d51f36f175a0f55e8722c37b04423cd00dd6a81381d359e768100d1

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