Malicious PDF — malware analysis report

Static analysis result for SHA-256 a979a8dff7c5140c…

MALICIOUS

PDF

78.1 KB Created: 2021-04-25 13:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 88f06b0d867e676180b73bc6ec05ec88 SHA-1: 20e8be302774642c40e0bad8f18576e5e8356455 SHA-256: a979a8dff7c5140c2bcf1ac817974151a3e82318ce1ebf6ecb04aea80f90e4c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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/strik?utm_term=safety+first+thermometer+rectal PDF link annotation
    • https://cdn.sqhk.co/jixuvepabu/iuRupxw/borat_soundboard_funny_sound_effect.pdfIn PDF document text
    • http://all-host.site/abstract_paragraph_in_apa_formatqiqvi.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/wibjjb6/29056241945.pdfIn PDF document text
    • http://about-central.com/fozonematumi259vg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_6064cb7450720.pdfIn PDF document text
    • http://investmag.org/vibikefiterapekaku1ry2r.pdfIn PDF document text
    • http://help-nanny.site/what_is_airline_code_ryanair_refundwidmy.pdfIn PDF document text
    • https://niregesop.weebly.com/uploads/1/3/0/7/130776037/b26ea9.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/gjvwiaP/70293020294.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/iWYI7uZ/67442444187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_6021c60acbea7.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/vugofokaki.pdfIn PDF document text
    • https://dananiruw.weebly.com/uploads/1/3/2/7/132741593/gogoji-zixigaborazaba.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/241855358150ar7r.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/iPhiVgh/best_online_payday_loans_speedy_cash.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/3016041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/febdecaa-cea2-40b0-8421-109c618102d5/fedesaxefoxutipifub.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/general_labourer_resume_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3349f96f-4315-413b-8e2c-7475d79c2121/how_to_write_a_health_proposal.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/73315817139.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/hill_house_care_home_cqc_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82ce2ea-8f00-4dd2-92fa-e208ae5e9b3e/word_family_lesson_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/81460259534.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/8773628985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e869716a-45c9-455f-a9e6-71f9b9b0bef0/what_reading_level_is_flat_stanley_his_original_adventure.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 5324 bytes
SHA-256: 557b1dab9eb4ee2e04ad28966dff319f731728fa47bd702f5106376fb2992ef6
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 10264 bytes
SHA-256: c31ffd595b57163ee797152445fd5a0cb14dfb1e9a73a38e0f3f4324aabf065a
font_02_sfnt_off0001152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140