Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1931b3fd37d76c…

MALICIOUS

PDF

63.0 KB Created: 2020-11-11 04:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 046eb46245300194112b8c7b91d7aba4 SHA-1: dceec40604d0a8297afae1ca0368a1fbda6f9bc1 SHA-256: 3a1931b3fd37d76c168617676c1d461ce4de128a3f20649330a42eb8541b00f9
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?keyword=oristaco+steel+toe+shoes In PDF document text
    • https://pareropifu.weebly.com/uploads/1/3/4/3/134349273/8bc9546c913.pdfIn PDF document text
    • https://sowuwiwegekop.weebly.com/uploads/1/3/4/4/134444151/nosapakukebamigedaze.pdfIn PDF document text
    • https://bigogewoxof.weebly.com/uploads/1/3/0/7/130739615/kijidojezef-vamubisuriveb.pdfIn PDF document text
    • https://fabobabi.weebly.com/uploads/1/3/4/6/134678451/sidaxodijaji.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/faramafatawur_lomubakimevid_muxefujemeg_jural.pdfIn PDF document text
    • https://vaxeratomox.weebly.com/uploads/1/3/4/3/134397216/paruj_bogejadidifi_janes_mapiji.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/vebir.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/7908730.pdfIn PDF document text
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/c8adfae96c1.pdfIn PDF document text
    • https://folesatabija.weebly.com/uploads/1/3/4/4/134441350/rolawesogo_safoj_viriwituviku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5f9fd12eb30bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5f89fb7b4f01f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb78064-36d1-4d3e-a1ec-4520e6a8261a/palma_de_mos_enrojecidas.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/kaxexezepulelupedapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd88ab94-4f63-41c2-9412-3730b652db53/21560236190.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_off0000bbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEC 4916 bytes
SHA-256: 2722f8a3311ec7fd5629a0fa02b7f48ed8ac1473c9e97b5c1f5010d1e27468c9
font_01_sfnt_off0000cc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC93 10244 bytes
SHA-256: be39038fad9cda1e13a55155827b9b60071feaaf351a80d973dd1d347e6f85d7

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