Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb91a2a060dee05f…

MALICIOUS

PDF

81.5 KB Created: 2021-04-03 06:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 278a9a3e18bc86b691b941bd51713f53 SHA-1: 79cd26168fc9075fb5ae0be92249668fff0ceaae SHA-256: bb91a2a060dee05fd00ec61cefd4093f3e19291c9df935156dc0cce9d593b66e
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated and truncated, includes references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=the+ffa+emblem+meaning
    • https://cdn-cms.f-static.net/uploads/4467277/normal_6022ced88697c.pdf
    • https://cdn.sqhk.co/zejizoguzut/jfhbiEv/38874202792.pdf
    • https://cdn.sqhk.co/guzowozuk/eihigh1/terigubu.pdf
    • https://cdn-cms.f-static.net/uploads/4419192/normal_603dd0cbb2b30.pdf
    • http://pebonemariv.mypressonline.com/singular_and_plural_possessive_nouns_worksheets.pdf
    • https://cdn.sqhk.co/berazanoga/iijUhhf/povis.pdf
    • http://joriwolujuf.sportsontheweb.net/nurani_quran_with_bangla_translation.pdf
    • https://cdn-cms.f-static.net/uploads/4500910/normal_605f276540026.pdf
    • http://jonipifenukiz.mygamesonline.org/rubejel.pdf
    • http://vofufime.mypressonline.com/10875358607.pdf
    • http://mumopajikex.mygamesonline.org/51279365628.pdf
    • https://cdn-cms.f-static.net/uploads/4382976/normal_6060b52b98e6f.pdf
    • https://cdn.sqhk.co/sepovili/jPZ9Igg/14135492838.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fd6588ee-d246-4f56-9dda-c382da2947a4/spring_framework_java_tutorial.pdf
    • http://tepominofujemo.atwebpages.com/92557952247.pdf
    • http://famomijis.onlinewebshop.net/akira_manga_color.pdf
    • http://durenifujogax.myartsonline.com/bavogelobufulibagami.pdf
    • https://uploads.strikinglycdn.com/files/dab39029-833a-4464-b5d3-2bb60d32ee65/17587476919.pdf
    • https://uploads.strikinglycdn.com/files/e5aacf1c-449d-405a-a0a3-dfdb63eb8d65/binedovadan.pdf
    • http://wilaroxu.atwebpages.com/axiological_assumptions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f475.bin
96fc5e2b8cb4283dc635801b892698dff1afa94eb48bd49dbc400d2eee2ef2b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 4592 bytes
font_01_sfnt_off000103e5.bin
4d0e1aef458980fc8a287ee0a6c418d1f26875dbbee1fc23bcd0cddefa49de9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 11008 bytes
font_02_sfnt_off00012978.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 4324 bytes