Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe47ed38ccc796d…

MALICIOUS

PDF

85.0 KB Created: 2021-03-10 19:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d32b6a000d89aa190a51e3d79e1a0c7b SHA-1: 782119e5a269120cd93c1a31e13fe8aa3c37fc0c SHA-256: dbe47ed38ccc796d873f1e51d2f2ce2a6b2c3753da6d344a498c542c418b3b70
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs and the PDF_SEO_LINK_FARM heuristic point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=cursos+de+ingles+en+linea+gratis+sep+2019+unam
    • https://cdn.sqhk.co/kabawamurelo/pvgdgdD/xodidogawapetadanuz.pdf
    • https://cdn.sqhk.co/livulopo/ujchgFQ/tatelanorejup.pdf
    • https://cdn.sqhk.co/rarinuva/eccNTl9/subway_team_member_job_description.pdf
    • https://cdn-cms.f-static.net/uploads/4390074/normal_603af130c4d06.pdf
    • https://cdn.sqhk.co/mujawiru/jjwjjhg/gomorumezo.pdf
    • https://static.s123-cdn-static.com/uploads/4469128/normal_60098f91e4e22.pdf
    • https://cdn.sqhk.co/riwifesineji/bJnWQSN/28469710571.pdf
    • https://static.s123-cdn-static.com/uploads/4454670/normal_5ff174e89b7ee.pdf
    • https://cdn.sqhk.co/zapajugadira/shbZhbI/63909417408.pdf
    • https://cdn.sqhk.co/remigalakefo/jfjg3cH/21769045278.pdf
    • http://help-feedback-amzn8.xyz/giwofatowulujesugel628.pdf
    • https://cdn-cms.f-static.net/uploads/4427080/normal_6035dd12b35c5.pdf
    • http://svoytrylend.xyz/hp_elitebook_6930p_manualrjjmr.pdf
    • https://cdn.sqhk.co/ferobisuw/jH6phbs/street_fighter_iv_champion_edition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_72f1268da60c4874abc0a524917a8286.pdf?index=true
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_c774f7470a824522a8bb049a5d3bf11e.pdf?index=true
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_2824a744ec234c0c99f7d962d4037c13.pdf?index=true
    • https://s3.amazonaws.com/zalomi/hard_and_soft_c_worksheets_3rd_grade.pdf
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_fe187c282924408e9b028425aa859692.pdf?index=true
    • https://s3.amazonaws.com/waxapoz/new_born_baby_video_status.pdf
    • https://s3.amazonaws.com/natewared/puxetu.pdf
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_4d881db737ed4a71a35ec1bd98add9c5.pdf?index=true
    • https://s3.amazonaws.com/posufij/safety_movie_age_rating.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea17.bin
ae31d91ea478a292618b8adaa93f31423f1f166033dd626957920e25e9e95cfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 5664 bytes
font_01_sfnt_off0000fd3b.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 1800 bytes
font_02_sfnt_off000105c9.bin
a139aa2a9f9c10e12d7242c3fc5935159e3ed63443cf27d4163d2103919be12c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 12396 bytes
font_03_sfnt_off00012e15.bin
f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 16376 bytes

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