Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1c8dbebd87a7f4…

MALICIOUS

PDF

66.2 KB Created: 2020-12-19 18:17:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bbc3c64c31b7ab67816b8395d5e2e5b2 SHA-1: 2c1dd26a5faa63b2c9b64b486758c4ecb9a526b1 SHA-256: 4d1c8dbebd87a7f45cf80fa3790ef54041c44b2e71c49abc8455a6d96ea28ace
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

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 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://trafffi.ru/aws?utm_term=chipboard+sheets+bunnings PDF link annotation
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/5364966.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/megipewekiwav_raxesewaji_gavitajodazosi.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/godifesetipose-kedapefuxenu-bivigewew-vosagu.pdfIn PDF document text
    • https://gojufoviwovefu.weebly.com/uploads/1/3/4/5/134515133/zixike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_5faede5980d50.pdfIn PDF document text
    • https://zeburunonuf.weebly.com/uploads/1/3/4/4/134458398/fojomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_5fa20bec44f7d.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/xakusineba/llp_amendment_agreement_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a985cd-5b42-47f3-bfad-cb9af3191263/pifotaxowulumemubipewas.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/audio_visual_aids_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd49b686-e5ee-435f-8a14-8e00c60af40a/53022178969.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/97743845427.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_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 5232 bytes
SHA-256: ec06491fa0d3ab34d129f3888ea71766971a8fe1c02d0e7355fc74f0be9a1642
font_01_sfnt_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 10108 bytes
SHA-256: 87533e340bc89210bce4e9bbff919b20dd11f036794bbc2baa65f086fcc1841d

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