Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e26ff143eb8f375…

MALICIOUS

PDF

65.2 KB Created: 2021-01-06 16:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8b5c7bed9bc81c72d2d2b405391d38a2 SHA-1: 9faf4149b7a8ecda5a35de46da9797495b9745a9 SHA-256: 2e26ff143eb8f375ae3a7437a31402b1ea9bd80930325cb9c13c261b2e32a59c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL, 'https://traffset.ru/123?utm_term=battle+slippers+pattern', identified as a potential lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=battle+slippers+pattern PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377112/normal_5ff354464d637.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/zupuxerevaval_fowik_dexosewo_fixajuwozawune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_5fbc5ad01e814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_5f95e7e8b79b6.pdfIn PDF document text
    • https://simofegike.weebly.com/uploads/1/3/1/6/131636923/vepivekabile_jaxuvunivene_vinufogogerob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5fef9a9a53c3d.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/4843387.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/nikuxowawosesef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fd3db8e48f8c.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/fosalizuzu/transformers_earth_wars_cheats_for_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db77e08f-ead0-464a-8d87-1cc4a228cc3f/pesezupetovixazinoda.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/dazaresurevisan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ef59c0-625c-4eee-a803-4520a368d83a/bdo_pet_exchange_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/advantages_of_auto_transformer_starting.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_off0000c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 4860 bytes
SHA-256: 3adcc2b6ca4fe0ba93dcb890a0df19f97790b9dbef4975766a79e7b2f773c1ca
font_01_sfnt_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 10932 bytes
SHA-256: d573f816b613a38e73dac7e5648d418fdc4a41e15708a4ac89fa0e0da1598f62

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