Malicious PDF — malware analysis report

Static analysis result for SHA-256 2639bbae10929380…

MALICIOUS

PDF

60.9 KB Created: 2021-02-17 04:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 08c2e2a072134c4138619cff59e32c94 SHA-1: c4f4585c1788a656bc815730db176977ae59354b SHA-256: 2639bbae109293804878480f9e4cc35a4cfcd150076aafd18581fe3340f67750
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body is heavily obfuscated, but the heuristics suggest the primary goal is to drive traffic to these external URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=motorola+symbol+cs3070+bluetooth+scanner+manual PDF link annotation
    • https://cdn.sqhk.co/lebogomatoze/Zzd4ih3/business_management_online_degree_programs.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/903b1c702ab6.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/4HEickS/dipiruzipijavumafi.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/7199710.pdfIn PDF document text
    • https://xefewovureku.weebly.com/uploads/1/3/4/2/134265706/wonewixefedoma.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/63dbcc3c8d.pdfIn PDF document text
    • https://titanukudolilip.weebly.com/uploads/1/3/6/0/136082060/pivobobeku.pdfIn PDF document text
    • https://cdn.sqhk.co/xatijafuwami/Omjgvoh/fireball_anime_2020.pdfIn PDF document text
    • https://xuvamedinomu.weebly.com/uploads/1/3/5/3/135392700/c19a965.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/adFCwhg/claw_machine_stuffed_toys.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_60236a07193f6.pdfIn PDF document text
    • https://wilivaja.weebly.com/uploads/1/3/2/6/132682565/7087943.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/dajajatavovubaxebo.pdfIn PDF document text
    • https://jopuwijexanubuf.weebly.com/uploads/1/3/0/8/130874501/wubudajosulalok-kasagu-moxolawefevelo.pdfIn PDF document text
    • https://jagavovukivotu.weebly.com/uploads/1/3/4/8/134881855/2496802.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dugubokig.rf.gd/calculatrice_scientifique_graf_pro_apk.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_off0000b1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F5 5672 bytes
SHA-256: ccd1b62fc39f5b7c92c55b4c6c1619414ecab358ed8648195396c958af804060
font_01_sfnt_off0000c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 9708 bytes
SHA-256: 309989fdf5d62d9f7390b1571b1dbc7165ebcf065d55435194fa8dbd4d4fcb43

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