Malicious PDF — malware analysis report

Static analysis result for SHA-256 473fadad227eacec…

MALICIOUS

PDF

91.8 KB Created: 2021-04-03 06:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ad5b65fef041337d9402cf0d0dd914dd SHA-1: 6bbfbf2c7045c002e84a850b3feb5ed16570cb58 SHA-256: 473fadad227eacec81c9b937c722f37920120a3612776e106f4ce8362b2bf7e8
156 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ClamAV and an ML classifier, contains numerous external links, indicating it's part of a link farm. One prominent URL, https://jacksth.ru/award?keyword=doping+in+conducting+polymers+pdf, is presented as a lure. The PDF structure and the presence of embedded links suggest an attempt to direct users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/award?keyword=doping+in+conducting+polymers+pdf PDF link annotation
    • https://cdn.sqhk.co/gizoxemovefi/GjfjeO5/photo_studio_furniture_props.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/hWYFhjW/cthulhu_realms_card_list.pdfIn PDF document text
    • https://cdn.sqhk.co/waxubisolo/hgbjfic/kimezixidalure.pdfIn PDF document text
    • https://cdn.sqhk.co/pidikuso/eV7JibR/xasoximewajamigubijemi.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/3igjdr8/amc_24_showtimes_aventura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/af6e0ac0-1081-4749-8d2d-263708269996/kijadewelomuposurupajudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d62315-83a0-4386-867d-4559b68bfe4c/robert_e_howards_conan_roleplaying_game_-_core_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ff77f0-1cb3-486a-9e81-08e4439d20ef/96143429373.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_a0a63a0a9ff8441ca7ebea911e6788a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c301488b-7fce-49e9-b65a-1a591fe6b0b2/94636283727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34081e77-a756-4b59-a1cd-27fe107bfaf5/56659576181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f632ed-1bb2-4279-b07c-6ba37eae16c3/nexivojorarajip.pdfIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_8cfb0bdc91bb443e80fd67ea71dd5c9e.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_eaaf82c980b34050b39aad4e7ea0f78e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edfb1aeb-b0a7-4c74-a909-6cad86f13a25/foxit_editor_serial_number.pdfIn PDF document text
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_3663afa0647242ef8017914f2bbe8bee.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 5248 bytes
SHA-256: 309dbe446271a989399503fb6a51b00e9265efbd56e688567c5465ab8cb8ea47
font_01_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 12176 bytes
SHA-256: e7f77c1589b4f131d1c3d799a29fe2071c29a04bb6ddb37a609aa5a647c88ea4
font_02_sfnt_off00015428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15428 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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