Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38280cf265172d5…

MALICIOUS

PDF

72.0 KB Created: 2021-01-01 08:55:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b138b7819d6214e4a67ff58adbe5e415 SHA-1: 26bbd9c339768705bc46c7727e43897b2920339f SHA-256: b38280cf265172d5c65da60e2492b8792dba49eec9cef158d5f1639638d52721
214 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains a link farm with 22 external PDF links, one of which, 'https://traffmen.ru/123?utm_term=what+does+it+mean+when+you+plead+the+fifth+in+court', is known to lead to malicious redirector infrastructure. The document body is heavily obfuscated and appears to be a lure, likely intended to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffmen.ru/123?utm_term=what+does+it+mean+when+you+plead+the+fifth+in+court In PDF document text
    • https://cdn.sqhk.co/wemonamo/hgjjijY/sputnikmusic_best_albums_of_the_decade.pdfIn PDF document text
    • https://xifekuvazunavel.weebly.com/uploads/1/3/4/7/134748582/lifipiwivefaver_xezizo.pdfIn PDF document text
    • https://nanagufema.weebly.com/uploads/1/3/1/4/131483019/sakez.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/luropi/medieval_collectibles_night_watchman_mace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf31d42-a253-42df-beb5-79109f4366cf/34034628235.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/affairscloud_pocket_may_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/38606522998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd69d9e-2758-46c1-8c3b-a10bfcac5dcd/natamimimoviz.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/delta_of_venus_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95be16e-e7da-4207-a3bf-f604798fbd02/wedding_coordinator_checklist_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/68429798592.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_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 5604 bytes
SHA-256: b16b17b81c63022a141ae96a0eedd719637b2cca8a3c3d71bdbd46cb2bb68725
font_01_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 10276 bytes
SHA-256: 42a8010febbfe5971b2a81bcc972bd44e7305db210178e315af307db7da737be

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