Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bd9f28391ab79f…

MALICIOUS

PDF

78.7 KB Created: 2021-03-19 20:25:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b281652983bdc537906f008bfc3d127e SHA-1: 7d1fe70150432a9443dc5d6898830add3089c26f SHA-256: b4bd9f28391ab79f3f126149b3b5ab5b629404c4cd50e1443eae9603dab3cb9a
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a malicious domain, likely to host a phishing page or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to an appliance manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=avalon+bay+air+fryer+manual
    • https://cdn.sqhk.co/weseseme/aMchfhd/halo_beyonce_piano_sheet_music.pdf
    • https://cdn-cms.f-static.net/uploads/4408865/normal_60480ee81df7f.pdf
    • https://cdn.sqhk.co/rabataxuvax/bNib4ST/88985523123.pdf
    • https://cdn-cms.f-static.net/uploads/4421623/normal_6038223f7bc58.pdf
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdf
    • https://cdn.sqhk.co/jututumogu/Bjdhhge/portal_gun_addon_minecraft_bedrock.pdf
    • https://cdn.sqhk.co/sojowidaz/dA3gMhg/45699191097.pdf
    • https://static.s123-cdn-static.com/uploads/4491436/normal_5ff2d52779c6c.pdf
    • http://rabota-plus.club/programming_in_c_exam_ref_70-483lhyan.pdf
    • https://static.s123-cdn-static.com/uploads/4387056/normal_5ff2231de3e04.pdf
    • https://cdn-cms.f-static.net/uploads/4370074/normal_601231f67f79f.pdf
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5fdd85d500b31.pdf
    • http://dlkmvkoenv.info/errata_sheet_formatprmap.pdf
    • https://static.s123-cdn-static.com/uploads/4446273/normal_600532dedcc38.pdf
    • http://psyhologrzn.ru/20408128623vnz5g.pdf
    • http://iminn.ru/tijejilaxaniponta69.pdf
    • https://cdn-cms.f-static.net/uploads/4421330/normal_6009f81b6b776.pdf
    • https://cdn-cms.f-static.net/uploads/4412606/normal_600cff9984959.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/28c9e3de-c2fe-4c63-9824-75cf2ffe55bb/19642206475.pdf
    • https://uploads.strikinglycdn.com/files/ece4cf26-a14a-44c5-a3ab-fe26dedbc47d/mupiruwidovarezevelajo.pdf
    • http://bazejufojowopor.epizy.com/arabic_handwriting_font_free.pdf
    • http://buzabokinoka.epizy.com/52660559936.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d7.bin
e65b16ec7462c1566bf9bb165f314b67973b02e4ed490babf02a417d8f0e7fe6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 5028 bytes
font_01_sfnt_off000108ee.bin
5bfef9ddfe95b4afbb891b52e7bbba052147582533da2e3b3439740ba9f42b77
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 10792 bytes