Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e44495371b0d63f…

MALICIOUS

PDF

81.7 KB Created: 2021-02-20 17:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eadb4460b6fe81b384ee9370f4b57460 SHA-1: c7da62ea402ed256545a2dd6434d77090f8c3cd1 SHA-256: 4e44495371b0d63fded2b0885e374681f71169a78f7d8d427793a8ddd4fede19
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

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=velineon%20vxl%203s%20manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385614/normal_6021e827aa214.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/niwogipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_602d7a1ea75c2.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/MiaieV9/samsung_calculator_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5fcd9d6d10faa.pdfIn PDF document text
    • http://grinallex.shop/fefinelovutevejuzomogjhk16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fd3c7922dbfd.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/mudulajatuza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417528/normal_5fca96d407419.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/iPIYjg1/35508116676.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/exo_terra_terrarium_lock_instructionsw9pqj.pdfIn PDF document text
    • https://werijininen.weebly.com/uploads/1/3/4/6/134635560/kesatawegibozomuj.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/wejovatusiwezipinn2txn.pdfIn PDF document text
    • http://organicsss.space/9236088695282l8y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402488/normal_5fed915617351.pdfIn PDF document text
    • http://how2clever.com/waganuruto3rvcl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 4992 bytes
SHA-256: 9af4694eb321251540e097383e5faa31bbd5c058d454b3c20a29a8523e968c0e
font_01_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 2232 bytes
SHA-256: 7edcec1dbc059d1e583af4d254e25e0feef50c810678138bd426408e750f40c7
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 11248 bytes
SHA-256: 872365f0f4be729d644e5999d271044f676ec317acd821d6e18c43b677384b84

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