Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bc6c98a32f6f81…

MALICIOUS

PDF

64.0 KB Created: 2021-03-03 00:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2c2864d445e0499b22095e54051a18ed SHA-1: 499a04bff30c6b2381f26732304dd54ef0df2d60 SHA-256: 86bc6c98a32f6f81ec60340dbf2fb9d1f503f5b734d3574fb73d25e6751f6e00
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including one pointing to 'soxebez.ru', which is flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm designed to redirect users, and ClamAV detection confirms it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create fake web pages or documents.

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://soxebez.ru/wix?keyword=tekken+3+apk+full+version+apkpure PDF link annotation
    • http://diwejibazetar.iblogger.org/53949341833.pdfIn PDF document text
    • http://firstdoctor.xyz/wozijedaluwimuviw07g7t.pdfIn PDF document text
    • http://smotrikino.fun/kinetic_molecular_theory_of_gases_worksheet2gujs.pdfIn PDF document text
    • http://summ-ita.space/gisuzonitedapasagunqlgs.pdfIn PDF document text
    • http://datingsexchat.site/clack_0948_water_softener_manualtgt5i.pdfIn PDF document text
    • http://justiciaforjustice.com/17402767042ucwrp.pdfIn PDF document text
    • http://1xbets-regs.site/how_do_you_find_the_molecular_weight_of_watern30px.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/numonisamivolawa.pdfIn PDF document text
    • http://gikunipif.epizy.com/guzexolezejavuvopa.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/zexuzokuvafatile.pdfIn PDF document text
    • http://kurujabarufuxe.rf.gd/ratogarukamixupiwukelo.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_off0000bd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD77 5132 bytes
SHA-256: fd40618df9064495f6832f322a67aa20ad37cb7c896cf76b2f7fb91ccffe634e
font_01_sfnt_off0000cf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0D 10184 bytes
SHA-256: 01a1e9fc7b227990bf3b8201c3725022b656665a6107ad901f1497af032d0bcd

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