Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5a9a4022b6c7a1…

MALICIOUS

PDF

78.6 KB Created: 2021-03-01 14:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a524d0fc7029cdd8757cb0a4aa827e97 SHA-1: 8890e60781ebc7d8aec0a398cf320cfad5f681fc SHA-256: 5a5a9a4022b6c7a1dbe371f23a116ba3a519ea888bb442f32a5cf3d8f4360320
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of external URIs and a link farm on disposable hosting points towards an attempt to lure 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://dugedepap.ru/strik?utm_term=monstrous+nightmare+information PDF link annotation
    • https://musekakilex.weebly.com/uploads/1/3/1/4/131406804/950f3bda38eaf.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/5823383.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/guujajb/auto_battles_online_pvp_idle_rpg_bot.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/what_is_the_meaning_of_araby_in_bengali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459162/normal_5ff9c13ab725e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_600c8b17848e4.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/xbggLif/memiwisibakof.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/gjjbhfk/youth_rewards_cash_app_referral_code.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/gh3Rfjj/oil_train_simulator_2019_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601bb7998b4f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_60059c29c6e1e.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
    • http://dapomajaberi.epizy.com/bau_cua_mod_apk.pdfIn PDF document text
    • http://temekem.epizy.com/basic_life_support_steps.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/activity_relationship_chart_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/magazine_advertising_proposal_sample.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 5036 bytes
SHA-256: abb701cbb4d70d1c36db6d7b912b6a27c8f77fb97e660e9c19f90c97303dadd8
font_01_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 10520 bytes
SHA-256: 3d2d69cf868cc1f9033f4cb355c388c290ef51e855ae6d8410e9889c6f545e37
font_02_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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