Malicious PDF — malware analysis report

Static analysis result for SHA-256 a660cd9be4276274…

MALICIOUS

PDF

69.9 KB Created: 2021-03-31 06:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6727316a0984bdd474c509bf79e73cdb SHA-1: b8de9db64d38bfbac7791a59fb7e72b0c5def70a SHA-256: a660cd9be42762744516aab2ea61045192023c358b574f642aed280815e6e94c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The document body contains metadata related to its creation by wkhtmltopdf, but no direct user-facing text was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=nato+phonetic+alphabet+gifts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428038/normal_600f5723c1891.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/different_types_of_tort_claims.pdfIn PDF document text
    • http://trylait.club/rejupejonasurudosapxfnjx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5ff086d55eef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_60348d0137ec3.pdfIn PDF document text
    • http://ridunculus.com/nawabarox0slq.pdfIn PDF document text
    • https://cdn.sqhk.co/tikomekove/jsia6gc/wunulovupebixuniguweje.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/lxjaNgc/parkour_simulator_3d_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5ff8b1085d1a8.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/vodefarabunukikopuronin.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/jjejhCd/91528802124.pdfIn PDF document text
    • http://gramnews.xyz/pengertian_alkalinitasbbmmw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_604e96aa969df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_604d35c94f618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_601f8ff988467.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/hZM1hjp/delasimodixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5ffc0215cc154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_603cb1740563c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiluxusimutine.atwebpages.com/cambridge_young_learners_english_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23370865-7c6e-4752-99cc-aa6be422a489/lewis_structure_atoms_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd851294-8f2f-4b9e-9f65-09abf36e01ab/world_outline_map_with_countries_and_oceans.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_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 5288 bytes
SHA-256: ec46dd9843cff71c064522765d01c9724747fe375dcf8c3b7785f20b8b5b0ace
font_01_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 11560 bytes
SHA-256: 387b1041cfff14fd09b2a6ddc3111e9837f3ec65fbb1faba0e3ce4df84b951d2

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