Malicious PDF — malware analysis report

Static analysis result for SHA-256 a859c2b0a61873a0…

MALICIOUS

PDF

92.1 KB Created: 2021-02-12 04:16:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9c4ab1b7293ed0fe0b6c41db750950fb SHA-1: 061eac5a07336f1ab0e26604d4c38975fd0b2f47 SHA-256: a859c2b0a61873a06ef0453735718648a1246de7d9ed1ddae66cf42d274a4a53
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=gta%205%20doomsday%20heists%20guide PDF link annotation
    • https://cdn.sqhk.co/gogojelawov/ijCYja0/duck_hunt_dog_smash_bros_ultimate.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/oqhagc0/herbal_essences_color_me_happy_conditioner_review.pdfIn PDF document text
    • http://cafe-cok.ru/astonishing_comic_reader_appru1cy.pdfIn PDF document text
    • http://slampochka.ru/46255724785utlx5.pdfIn PDF document text
    • http://harmony-market.ru/74940368757oej49.pdfIn PDF document text
    • http://copyright-help-report.com/eclipse_ide_for_javae2sgq.pdfIn PDF document text
    • https://cdn.sqhk.co/vorowobenune/ihjeyif/79812716304.pdfIn PDF document text
    • http://vusikudezewoteg.iblogger.org/c_m_d_ki_full_form.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/livro_para_aprender_francshukfq.pdfIn PDF document text
    • http://testrun.ru/766758727091h3tc.pdfIn PDF document text
    • http://smartbright.club/balancing_chemical_equations_worksheet_2p0ipw.pdfIn PDF document text
    • http://usesalon.xyz/ranovasodubivomuxalosa6ge1z.pdfIn PDF document text
    • http://lightly.store/carrier_air_conditioning_instructions_manual8arfs.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/bJWidk4/corpse_party_blood_drive_ps_vita_download.pdfIn PDF document text
    • http://ca-manalapan.space/pokemon_go_kanto_pokedex_151ru4q8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minirulo.epizy.com/collection_letter_template_medical.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/sigunojiri.pdfIn PDF document text
    • http://labinugekifuv.rf.gd/luzunixonugusivemex.pdfIn PDF document text
    • http://wiwazisumi.rf.gd/implosion_mod_apk_offline.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_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 5368 bytes
SHA-256: f7b93c0cfa2e7f2f630f98a9b855d4335466bd24424dcab56d017707f8937865
font_01_sfnt_off00013f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F70 10420 bytes
SHA-256: d1c89b88f399571a8c3495f114dff406bea12ec37fea94181038e0f0746e1bb1

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