Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61a98ce6ed47239…

MALICIOUS

PDF

74.9 KB Created: 2021-03-19 10:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e05266f53b4fccfeaab5eb5fd25000d4 SHA-1: 58bbfc6a3344ab3ed805548a913154a3e4819791 SHA-256: a61a98ce6ed47239b3f5c6ccc6d52807379f83961dc2f0fea3ea49fed6440e26
134 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm designed to distribute content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=the+empathy+exams+pdf+download
    • http://dutarotanazosuv.medianewsonline.com/16277516354.pdf
    • http://luminar4-download.xyz/weregozaliwojrv0ht.pdf
    • https://cdn.sqhk.co/jalotenabo/ajijabI/madutopogodazewases.pdf
    • http://igonlinesupport.com/niturevj8zlo.pdf
    • http://zoosalon.org/92321962071urt04.pdf
    • http://reduslim-italy.site/77914218497mv5om.pdf
    • https://cdn.sqhk.co/vujejanar/dkM2qjg/62968234058.pdf
    • https://cdn.sqhk.co/larovejadeb/CIMojeC/34975257034.pdf
    • https://cdn.sqhk.co/kelarega/f4cpzhh/dp_card_throwing_trick_shots.pdf
    • http://trikolor.site/cheap_thrills_song_mp4ot68j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://safodur.epizy.com/xiwinelog.pdf
    • https://s3.amazonaws.com/liguwubore/bharti_axa_life_insurance_company_information.pdf
    • http://wumafopid.onlinewebshop.net/public_policy_in_australia_theory_and_practice.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/faguk.pdf
    • http://sanikivatuma.rf.gd/select_auto_submit_form.pdf
    • http://keviful.epizy.com/difference_between_microsoft_project_online_and_professional.pdf
    • http://xovipofeguz.epizy.com/rufidepudonaneru.pdf
    • https://s3.amazonaws.com/bisiku/resignation_letter_sample_in_tamil.pdf
    • https://uploads.strikinglycdn.com/files/5183b3a7-c7ae-46f7-95eb-d2d41228b48d/how_to_connect_brother_wireless_printer_hl-2270dw.pdf
    • https://s3.amazonaws.com/tesodagiwor/how_to_fill_floor_jack_with_fluid.pdf
    • https://uploads.strikinglycdn.com/files/f229d49c-92b6-41c8-8da1-ac12355540b2/82601037182.pdf
    • https://uploads.strikinglycdn.com/files/f2dda16c-6cf6-44a8-95ed-f65ae36b4008/vuzukaxijon.pdf
    • https://uploads.strikinglycdn.com/files/adb5c7ac-f512-46df-b902-c37bbdbcebb4/mukinojuromoladojove.pdf
    • https://uploads.strikinglycdn.com/files/fd0d1bdd-fa98-4510-88e8-f3b1c7a2302d/35562030212.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e4.bin
e829867803ee395ff07abe6e532b112accacee20ad57fce7f92aec89f460980c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 5396 bytes
font_01_sfnt_off0000f839.bin
66fa2f6891796c739845c8386204303e8f7676cfe8495246ccc0413dd0506909		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 11112 bytes

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