Malicious PDF — malware analysis report

Static analysis result for SHA-256 201415522a4ab9af…

MALICIOUS

PDF

75.8 KB Created: 2021-03-06 10:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 81ca280736ae73e2fba3926b40b204c9 SHA-1: cb7e31c5227704832baf9375b1459893082a818c SHA-256: 201415522a4ab9afef3b1933bf04c48ddb2968f2d0d6f21d80c63ef28226b17f
186 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. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=adobe+premiere+crashes+when+importing+files PDF link annotation
    • http://fadulifakibul.medianewsonline.com/69316663513.pdfIn PDF document text
    • https://sewusadata.weebly.com/uploads/1/3/5/4/135401056/8540421.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/ee9PqdA/9853164309.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/ibykq0t/rupabe.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/2ifVbNz/12400149095.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/mefaxojizogemekevija.pdfIn PDF document text
    • https://wesedujixezibo.weebly.com/uploads/1/3/1/6/131606467/8188e7117356c.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/herman_miller_aeron_chair_service_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/kawasaki_fs481v_engine_oil_type.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/nzxt_phantom_530_black.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/35980629287.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_5a7eddfda9f54a418fcf01fdf08fde1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf9a9e0-8559-4b60-9bf0-1a56b141a309/88463114752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c9e5bf-b5ac-4a79-8814-f555084c594c/dopola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dcca0f6-f7ca-4ba6-9cd0-c61f2cd9fbfa/contract_attorney_houston_tx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b27a0e-cb3a-4f74-b2e3-a1849028578e/what_12_step_program.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_6ebb3d4d41c5435a9343e61fbda6813f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/alcohol_120_full_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/pedoti.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_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 5788 bytes
SHA-256: 43712673b3aea64a252375233266164f7f62746137b43cc5bc470a093e39c197
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 10932 bytes
SHA-256: 42d960acbc3f1d0d0d2499f537af183ee062e05948e143486f6086bf9c6e34e9

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