Malicious PDF — malware analysis report

Static analysis result for SHA-256 8834d616bb5c38c0…

MALICIOUS

PDF

81.0 KB Created: 2021-03-06 18:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9c4ac74ded48d2cc751ec43844d74a0a SHA-1: 699b0ee78e90cf4618dd2aad30bc6516f60dacc3 SHA-256: 8834d616bb5c38c0702f649918e14f0c228ce9c72504f5673541d3b291f30308
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm hosted on disposable domains. The embedded URLs point to suspicious domains, suggesting an attempt to redirect users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to compromise users through web-based lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/wix?keyword=humu+humu+nuku+nuku+apua%2527a+meaning PDF link annotation
    • http://7gusevshop.space/fenodagomapifewibu21his.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/kinumogisosenovur.pdfIn PDF document text
    • http://gozatelaji.22web.org/business_casualty_loss_form.pdfIn PDF document text
    • http://digovin.getenjoyment.net/hellyeah_i_dont_care_anymore_letra_espaol.pdfIn PDF document text
    • http://zusazibob.iblogger.org/63382246655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_600b46298dbb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_6040eeb67850f.pdfIn PDF document text
    • http://hookup753.fun/likosapigug1lsl1.pdfIn PDF document text
    • http://ketosimple.online/984057789347w1ix.pdfIn PDF document text
    • http://sodahq.pro/rejoguletilivakebiwipccbc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367281/normal_5fc71ff817cf7.pdfIn PDF document text
    • http://easycreditscore.info/how_to_make_an_emotional_poemiml0u.pdfIn PDF document text
    • http://sewutaf.iblogger.org/97575941970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5fddfee6d1a08.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/00d03e20-730b-4fbc-ba29-91fd2f0bd6bb/what_is_survival_of_the_fittest_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b460990b-dca6-4e0a-af55-ed2d35a99554/interior_designing_games_app_store.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/54914406726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c41786e-8ea2-49db-a469-e28946137572/does_native_american_pay_taxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13791417-6be5-4ec6-84c3-7571a2d5c3a9/burger_king_breakfast_deals.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_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 4984 bytes
SHA-256: f4876aa9a27fa96a7deea4149c26cf04f574d3cdd2618ca7b71e642b49fcc129
font_01_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 11184 bytes
SHA-256: ad3ff8b7c76bbabfbd2d82d7915666793f3102750fa902c2e9f7d885082abdd1

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