Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c22cd8a151c4336…

MALICIOUS

PDF

73.7 KB Created: 2021-03-02 18:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 55cdb6de2b61b3e4031a7eeeb4c969e5 SHA-1: 59f807bc3c216dd335c8cb7af3e8f182dbe9d4d1 SHA-256: 5c22cd8a151c43360a4158b184d584bf2f2161c38d119cd7ffd7a410072dc31f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/wix?keyword=waterproof+paint+for+wood+outside PDF link annotation
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/fesibadosakiga_modovifevita_nupatazolizipo.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/2hhbgic/japanese_translation_app_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/DQhjIjd/check_guitar_neck_with_straight_edge.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/3542514433.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/fgegjia/lucky_skyblock_map_1._14_4.pdfIn PDF document text
    • http://bivadula.22web.org/ritomoruzimelujebikekila.pdfIn PDF document text
    • http://boost-shop.xyz/5e_shaman8dzwe.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/2yOie8m/history_of_christmas_ornaments.pdfIn PDF document text
    • https://cdn.sqhk.co/jigidokasaga/iak5jfI/game_of_thrones_finale_night_king.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/69937504222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/waloxarukareb.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/ars_notoria_game.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/85932803356.pdfIn PDF document text
    • http://favigagiwu.epizy.com/87536741639.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/instagram_app_for_android_4.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/jikupoxotedixegikabuzoxu.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 5108 bytes
SHA-256: 5001779c210c9da3d06c71db58a5957f0f0a60ef280da17223fc0d375f43bb7c
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10208 bytes
SHA-256: 773c75d09ec3c1edb76e145410c675804b7e6b7a0c287e48d9996c30697b0cf2

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