Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61133e8a1d2b981…

MALICIOUS

PDF

76.8 KB Created: 2021-04-01 01:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 98617cfe8d7b783a1d5e0f904cbe76b1 SHA-1: d405297908e57b35215aa3e76dde0e485df73f9c SHA-256: b61133e8a1d2b98129e3fa85e1bf879b427e75971b034b70ffd3a3ff0cf93b56
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The presence of numerous links to disposable domains, including one explicitly using a 'utm_term' parameter suggesting a lure for 'viva video editor apk for pc', indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/123?utm_term=viva+video+editor+apk+for+pc PDF link annotation
    • http://popenufavox.iblogger.org/sotobofu.pdfIn PDF document text
    • http://javebamugizal.66ghz.com/multiplication_table_worksheets_printable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5ff0e5df24eca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_6037b7fccccc6.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/47400515079.pdfIn PDF document text
    • http://damodudajipofem.22web.org/4270389499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_600d8c1cc88c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417526/normal_5fc7749323033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443619/normal_5fddffa641519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448731/normal_5ff2950d4058c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_5fea1db2781eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5fea12c0bf859.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/wesokovagiberakukurorix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ludodugadigepez.rf.gd/50410632038.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/arduino_processing_ide.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/48743295321.pdfIn PDF document text
    • http://rajowezurub.rf.gd/antibiotics_in_pregnancy_guidelines.pdfIn PDF document text
    • http://mafevinojoxumul.epizy.com/85651376821.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/navy_seal_fitness_test.pdfIn PDF document text
    • http://pozaberu.rf.gd/34214965756.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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5028 bytes
SHA-256: 5a8060d2f31bf4eadd0f4ce27c85acbbd3831ba6063c05491ad1467eb045c606
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 11404 bytes
SHA-256: 2cdea49bcfc35544fe9672a709bc187b436d9b438f6f4a0d0ec56178f1d64b14

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