Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa5affe9c296908…

MALICIOUS

PDF

75.4 KB Created: 2021-06-02 22:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f9d8bef848b585988e60243ab50776a SHA-1: 9e687db5b0b03e8b3b2d43aff81efcd5efbb0e13 SHA-256: 5fa5affe9c296908c551e3f0ef05d8cadca3b452813dc2735b1f92003a95b17b
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing and trojan threat. It functions as a link farm, presenting numerous external links, likely to facilitate the download of further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may also be used to trick users into providing passwords for encrypted archives, a common tactic to bypass security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/pbw?utm_term=el+despertar+del+diablo+1981+pelicula+completa+en+espa%25C3%25B1ol+latino+descargar
    • https://mavepokakep.weebly.com/uploads/1/3/4/6/134628520/8206721.pdf
    • https://lukejofavum.weebly.com/uploads/1/3/4/4/134455809/riramutamevu-zoxafogo.pdf
    • https://zewazinox.weebly.com/uploads/1/3/4/2/134235380/dupevi_witovibin_nokifeb.pdf
    • https://cdn-cms.f-static.net/uploads/4367922/normal_6036fcff7ade7.pdf
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/aec85cdcae48.pdf
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/811418.pdf
    • https://cdn-cms.f-static.net/uploads/4471256/normal_602885527be17.pdf
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/3081291.pdf
    • https://cdn-cms.f-static.net/uploads/4382976/normal_604421f31f117.pdf
    • https://static.s123-cdn-static.com/uploads/4387240/normal_5fdfdaa6a0c02.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zepadatoju.pbworks.com/f/acordes_de_teclado_cumbia.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144418647/google_drive_jurassic_world_fallen_kingdom_mp4.pdf
    • http://zepadatoju.pbworks.com/w/file/fetch/144416121/62949240049.pdf
    • http://kizisoj.pbworks.com/w/file/fetch/144519615/the_core_competence_of_the_corporation_harvard_business_review_summary.pdf
    • http://damopijos.pbworks.com/w/file/fetch/144499710/93932619459.pdf
    • http://gibuwodebu.pbworks.com/f/freecell_game_for_mac_free_download.pdf
    • http://mukibilevejo.pbworks.com/w/file/fetch/144467055/how_much_is_it_to_join_crowd1.pdf
    • http://lopofemusun.pbworks.com/w/file/fetch/144501675/veledido.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_off0000d453.bin
481f3c60425e42f43ce7f9a1662a400bfc3091fa06498f71612c93fc0c8bccb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 5984 bytes
font_01_sfnt_off0000e84d.bin
0a88bd441c57f64ba60adba82ecad6985cd0dd6d9f99d307aa13cbf0662bfb42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 11852 bytes
font_02_sfnt_off00010eaa.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 4324 bytes

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