Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d37b852a41aff4…

MALICIOUS

PDF

66.1 KB Created: 2020-11-26 12:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 697320749e18048a4f43ad461eeb8b95 SHA-1: e72591a3a3e692850b56f1fa097a7930071285c1 SHA-256: 54d37b852a41aff4b2fbe2f85554723bf6774a19a2bd951e02537ba8f98af057
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 PDF SEO link farm. One of the primary external URIs points to 'trafffi.ru', which is flagged as suspicious. The presence of many links, including one to 's3.amazonaws.com/zazelujeju/latin_america_landforms.pdf', suggests an attempt to manipulate search engine rankings or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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=bash+neil+labute+monologue PDF link annotation
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/6bb049792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5fa681189af03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f906580a476c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5f89da26b75fa.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/zagowedimasoz.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/zazelujeju/latin_america_landforms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63f63a7-b9a8-4693-a662-973ffc3d0e2c/rutotuzipemuladenigofuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86fb3fc-3cb9-4887-880e-6af72cd72cd5/kiturekiwepuwumasiliviza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5600c025-79e6-47c3-b82e-a0ca67ff2b09/68932903859.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/57276380486.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/xopezazozuladadufivun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374f16f5-d99b-407e-9ec1-83bd2e64ee8c/dukafukafiwobisonileko.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_off0000c6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B5 5192 bytes
SHA-256: 270f9722bd796936c9911812d208832005c39e55b96a420e2fa0562b617ac747
font_01_sfnt_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 10436 bytes
SHA-256: 6f003de6d91f06ce9074043e4c4460dae039827503484fd8476c976cae2aa1c0

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