Malicious PDF — malware analysis report

Static analysis result for SHA-256 8657a9872f581b34…

MALICIOUS

PDF

78.3 KB Created: 2021-03-22 10:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 253140ddfa4a8d62baaf1a74f474b630 SHA-1: 9dee44777fd31fb292dec6c9d98bbc56ed2e2275 SHA-256: 8657a9872f581b34ec8dc7e1ddbe076c1ea6796d44edb5553d1347daf20050d2
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious or deceptive websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/aws?utm_term=internal+audit+manager+salary
    • http://daxosivonoz.iblogger.org/stages_of_language_acquisition.pdf
    • http://bakuvuwojesefa.iblogger.org/pokubajokikuti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/75677bd0-453e-4fe9-92f1-488e9337de31/sony_str_dh520_manual.pdf
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_c6e5b991c51d4cd39c065776f2ab001d.pdf?index=true
    • http://wefofumerari.rf.gd/cardiogenic_shock_management.pdf
    • http://xodolipifonabo.epizy.com/vuvagisabidumubevetevi.pdf
    • https://s3.amazonaws.com/baxekojojexusol/21161913263.pdf
    • https://s3.amazonaws.com/senodiw/bavoxujekumodesakupar.pdf
    • https://uploads.strikinglycdn.com/files/d7ec08d7-a016-4318-9f1f-2cd1c4d79007/scooter_repair_shops_rockford_illinois.pdf
    • https://uploads.strikinglycdn.com/files/9b28415a-f77f-4bab-8cd9-3db795025208/daily_use_english_to_urdu_sentences.pdf
    • http://volulel.rf.gd/98415251046.pdf
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_5beb85c5cd2d4a2d9be1bce3f91da78c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/24defd8c-c730-487a-9646-deafdc5a4ed8/mastering_the_art_of_social_media.pdf
    • https://s3.amazonaws.com/suxugipipolazog/sansui_tv_service_centre_in_vadodara.pdf
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_61341cfc51f3435d956805645264ccd6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aaafdd9a-9bfb-48b0-af66-fc9f4b511baf/the_devil_wears_prada_full_movie_netflix.pdf
    • http://joxumokuri.epizy.com/financial_planning_and_capital_structure.pdf
    • https://uploads.strikinglycdn.com/files/cc990f44-8938-4228-b8d0-b7dc5c866965/sex_education_season_3_trailer_netflix_ita.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_off0000ea50.bin
0459f040d52c2d46ed0889af3cc76ec7bb3c9e9d9d2926eb7c7af1e1f3e173d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 4956 bytes
font_01_sfnt_off0000fb00.bin
3a5790b9725ffdadfa1a218b2bbcccfc840a8e326eef9f03799619c039b0edd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 10172 bytes
font_02_sfnt_off00011db9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 4324 bytes

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