Malicious PDF — malware analysis report

Static analysis result for SHA-256 870199603885b11d…

MALICIOUS

PDF

76.9 KB Created: 2021-05-12 00:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f09f3f1dbe291d94d6b77a438637ee57 SHA-1: 8029acfc5070b8532c13b0ca78869f7a01008848 SHA-256: 870199603885b11de05ebcacf18a16d21ec759fe848a4d5747ef72ece4e92e27
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, identified as a link farm by heuristics. ClamAV and ML classifiers also flagged it as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=rene+descartes+meditation+1+and+2+summary
    • https://cdn.sqhk.co/tirabipati/qKQykge/wotexisowegigamajo.pdf
    • http://pumba.fun/xufibodakoxv125.pdf
    • http://onatural.space/99657810558posvu.pdf
    • https://vudubigudimuw.weebly.com/uploads/1/3/4/0/134016717/tawujenadexale.pdf
    • https://tugupititu.weebly.com/uploads/1/3/4/8/134887320/puwepunuzikokunezit.pdf
    • https://cdn.sqhk.co/parabeset/TjiUjg2/how_to_make_best_gliding_paper_plane.pdf
    • http://metalllift.ru/mibepilejopajeroxizlkmv0.pdf
    • https://cdn.sqhk.co/fawabanof/TOsbF7y/mineral_oil_uses_wood.pdf
    • https://cdn.sqhk.co/patagarinixa/hjcmGgh/nexagaxukumuposejan.pdf
    • http://trokot-roznica.xyz/nuvufasonezufowaminunuro3kbji.pdf
    • https://cdn.sqhk.co/sirepajaku/IEOgdjf/autocad_3d_bend_pipe.pdf
    • http://spoonnumberone.xyz/lutokubugadaze7l01g.pdf
    • http://govnososal.xyz/54644719687krbj1.pdf
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/nejobalitex-joziwek-soleriragi-xepileduvamasot.pdf
    • http://prizyivnik.ru/how_to_set_acurite_indoor_outdoor_thermometerjnhtn.pdf
    • https://cdn.sqhk.co/perolurowona/yFhawij/gun_shot_mp3.pdf
    • https://cdn.sqhk.co/waxigapo/eSQibkm/59807554082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3ebdf8dc-160d-4859-affb-d087fec91068/misojobarapewekuxa.pdf
    • https://uploads.strikinglycdn.com/files/5158becb-b57f-40f6-bfa5-f128c5ebd616/is_cyberpunk_2077_on_ps5_buggy.pdf
    • https://uploads.strikinglycdn.com/files/e126189b-a2db-4990-91b3-9d1cb449e7b7/65399891442.pdf
    • https://uploads.strikinglycdn.com/files/081a8e32-0df2-4865-ae98-4c840bc040dd/definition_of_human_error_in_aviation.pdf
    • https://uploads.strikinglycdn.com/files/5152cbb4-0dfb-4a8d-85eb-667ec60be2fb/10126405592.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_off0000ef98.bin
b3faa0db90041faded86e6629f16b68f3a88b9582eca72a5d51420878afef7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 5344 bytes
font_01_sfnt_off000101bc.bin
8ba53135684621cc64621e2903527e74b9b01d39c2e6d214a6e0bd1232011e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 10528 bytes

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