Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcc9fe039553afb…

MALICIOUS

PDF

103.6 KB Created: 2020-12-28 08:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4177d04529d0e6c195849dcafe0cd24d SHA-1: 492f03976c788f5395a6e303604fc2138c3c16ed SHA-256: fdcc9fe039553afb7288352b00c40d9c6433cf8f3876d6b17749da52e32449a2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=sheet+erosion+chemistry+definition PDF link annotation
    • https://luleloneluso.weebly.com/uploads/1/3/4/4/134450102/d43831d99.pdfIn PDF document text
    • https://gibitomenufe.weebly.com/uploads/1/3/4/0/134041720/gagelatikageb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_5fbd9b2411e62.pdfIn PDF document text
    • https://daxapiruxibi.weebly.com/uploads/1/3/2/7/132712323/luxipesinararot.pdfIn PDF document text
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/3858904.pdfIn PDF document text
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/4388865.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/bopuxosavubare/16036310702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e10959-3c7b-406e-b359-8cafc0cfe146/14119887015.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/keroxidirezomoberukuruzox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4c370f-9375-43f8-bab4-94187f4c40d4/honda_fr-v_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/21138069050.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_off0001586e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586E 5224 bytes
SHA-256: a217f5ba7f3a0e24b2282b74db9e42ff7d0e3cf7331d20d6e6a1eb6ab9e1f5fb
font_01_sfnt_off00016a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A17 12200 bytes
SHA-256: 17d8d87a3ffb5816137dbe48beaa40ac83fd1cd704d4838cbac29be4be2dce7a

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