Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdad4c88b54c564…

MALICIOUS

PDF

67.3 KB Created: 2021-03-15 16:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b314ddd71977e1cbd912c6ccf1b0e472 SHA-1: 52e06babea4ac3117b386d06f4174b5f0f78f148 SHA-256: 8bdad4c88b54c564360051a6d7d862a48b4e76d41307a5498afb472691636791
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains text related to 'Jurnal abortus provokatus pdf' and was generated by wkhtmltopdf, suggesting a malicious document designed to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://golowaki.ru/123?utm_term=jurnal+abortus+provokatus+pdf PDF link annotation
    • https://cdn.sqhk.co/pifonode/ghejjid/xedifev.pdfIn PDF document text
    • http://islta.fun/what_is_wilderness_first_aidnlgr5.pdfIn PDF document text
    • https://gokaletuwatuni.weebly.com/uploads/1/3/6/0/136098233/6099955.pdfIn PDF document text
    • http://mojofaza.mypressonline.com/is_hisense_roku_tv_bluetooth_compatible.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/jdX1if7/30055958798.pdfIn PDF document text
    • http://reactivaperu-2020.com/vezokuvifasohzwx.pdfIn PDF document text
    • http://oneitshop.info/854120536933y5r4.pdfIn PDF document text
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/bowobufokigipug.pdfIn PDF document text
    • http://lnstagramverifycentre.com/wireless_communications_incsu5cr.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/diccionario_biblico_reina_valera_1960.pdfIn PDF document text
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/sebisomefuzuvopexag.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/cds_2_2020_answer_key_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/BhjFvdO/s._g._o._t_test_kya_hota_hai.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_7d61d8e3593d47faad6de7b6dd69ccac.pdf?index=trueIn PDF document text
    • https://721ea522-a1f6-4523-903e-24b3c8014629.filesusr.com/ugd/5a834c_f4e746380ba34784a599949f9cdee000.pdf?index=trueIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_2f9aecb0a3d84b6bb348bb141db73c27.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_0d1f2170a7744255a66da2e35deea465.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65d2b9e-93c6-4068-b483-dd85a3b9f0bf/42529150860.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_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 5288 bytes
SHA-256: 354efa91451447d1ee319fe95a758b45674c35e21645093c95c8050917575893
font_01_sfnt_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 10868 bytes
SHA-256: 537d853bb396e31314c281881460b88d34dc2e72800c829631449d077c3f86ed

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