Malicious PDF — malware analysis report

Static analysis result for SHA-256 873a489102348346…

MALICIOUS

PDF

72.6 KB Created: 2021-03-10 22:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4fa095c2c4ba00e3730215676509be8b SHA-1: b0be118a2204bfc1f786e7554739118f64f3eec2 SHA-256: 873a489102348346829dd44f7aba3b3b088ef595b9f8d078906638b87e62a25e
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'subnautica apk obb download for android', suggesting a lure for potentially unwanted software. Numerous external URIs were extracted, with one prominent example being 'https://xajibur.ru/wix?keyword=subnautica+apk+%252B+obb+download+for+android', indicating the document's primary function is to redirect users to external sites. No scripts were extracted, but the overall structure and embedded links point towards a phishing or software-luring attack.

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://xajibur.ru/wix?keyword=subnautica+apk+%252B+obb+download+for+android PDF link annotation
    • https://cdn.sqhk.co/tezizejaropu/Maoheii/83915943189.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/greek_god_names_that_start_with_a_p.pdfIn PDF document text
    • https://vabadagijuruka.weebly.com/uploads/1/3/1/8/131856539/a96fb0464c.pdfIn PDF document text
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/3451939.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/jbZAHh3/quiz_duello_newspaper.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/how_to_fix_gas_knob.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/AifKgnj/vodisejur.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/94465762913.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/chopin_ballade_no_4.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/mCGTMhf/frantic_synonym_hectic.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/31984078842.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nonosolagosev.epizy.com/medical_terminology_file.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/aa_unlock_apk_chomikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/banana_pi_m3_ubuntu.pdfIn PDF document text
    • http://jurelofi.epizy.com/82828118341.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/42046466147.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/jopidepilobizuk.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 5372 bytes
SHA-256: 588921210a950730425caeb7315e5751803aab61cafb2d7d55e31c876d40dcdd
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 10620 bytes
SHA-256: 033cf2e867b207538468b10bd686a101657075db429ac780d0d0b273a104ab91

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