Malicious PDF — malware analysis report

Static analysis result for SHA-256 04421a0ac25fcbb6…

MALICIOUS

PDF

101.7 KB Created: 2021-03-29 14:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0f048e1396b861a1739487eb581b4495 SHA-1: d7b99e236e9b440110097ebcdc78df10a71f5dd8 SHA-256: 04421a0ac25fcbb65f8f97a6c743983ffc757dba19676eaf45d533d404a878bf
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains an external URI pointing to 'xajibur.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Watson behaviorism pdf'. No scripts were extracted, but the PDF structure and external link suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=watson+behaviorism+pdf PDF link annotation
    • https://cdn.sqhk.co/furigelo/cM3ie43/wiwemerasiwekuwesiravuwex.pdfIn PDF document text
    • https://cdn.sqhk.co/dekawako/tgfjbii/63226607313.pdfIn PDF document text
    • http://noksipals.online/79557430698dx9w9.pdfIn PDF document text
    • https://cdn.sqhk.co/loxosefivipo/jhgRdHm/671823575.pdfIn PDF document text
    • http://umdtheatre.ru/experience_certificate_for_civil_engineer_in_indiaa4z2t.pdfIn PDF document text
    • http://com-signto6.xyz/nubugibokq7f5h.pdfIn PDF document text
    • http://naturwows.space/tavulagotegigosidozuvhy3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_b91f091e63304ce3ac5dc1f884bf02ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/569d1680-163a-4f59-bf50-7455ea4ad60d/what_is_l.c.m_in_mathematics.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_637a77eeb6114d54bd76e9dd3ceeb945.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/android_republic_fgo_jp.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_833a0530a00649a48db8982ef625aef8.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_57eea2c794494d32ad22b76c87caf233.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa35a8f-6509-4364-9d44-56aabca55c72/37848201171.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/lines_and_angles_class_7_exercise_5.1.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_3da012cc9ff64192b6127a0b90967734.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b307319-56f1-4a75-9347-c69a04edcf7c/25690783197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c2b0dd-48c5-4b66-ba37-d840b8786d7e/is_star_wars_galaxy_of_heroes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/why_does_my_samsung_dryer_not_start.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/64389776929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a0ed01-37fd-4e6c-ba35-58265d468051/how_to_put_on_a_toga_roman_style.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_off00014f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6A 5464 bytes
SHA-256: 1235c2a13764ea4b449a58f575ee2581477b58536b3a0aea1dba4c79bf78784a
font_01_sfnt_off000161df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161DF 11296 bytes
SHA-256: a0cb5cddc00a2849d998a17255e4241f2562190cb9b172618131a31258f63a17

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