Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2770929297d7cc…

MALICIOUS

PDF

78.3 KB Created: 2021-02-26 02:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6cc2b7aeb251f8f802e8b4bb5c84f1e0 SHA-1: 2e7610f90aa0f12118269004b6b14e7d4b02b3f0 SHA-256: 5b2770929297d7cccf8d9c4a13271d54e11d2d3bd7200984133196c0f49204ef
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts a large number of external links. One of these links, 'https://seumenha.ru/strik?utm_term=cuantas+clases+de+judios+hay', is flagged as suspicious. The ML classifier and ClamAV also identified the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of a link farm in a PDF suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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 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.
  • 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://seumenha.ru/strik?utm_term=cuantas+clases+de+judios+hay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392861/normal_600e9a746c1aa.pdfIn PDF document text
    • https://fowawuxubave.weebly.com/uploads/1/3/4/7/134759807/zavub_xititisazefoxif_vujovazuririv_rubezarede.pdfIn PDF document text
    • https://rarikomedos.weebly.com/uploads/1/3/4/6/134616559/semadupokomosetonu.pdfIn PDF document text
    • https://taborufizuxedo.weebly.com/uploads/1/3/5/4/135400835/4998450.pdfIn PDF document text
    • https://toxutumopomepe.weebly.com/uploads/1/3/5/3/135327812/979295.pdfIn PDF document text
    • http://detixaluziweki.22web.org/sweet_tagalog_pick_up_lines_apk.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/bodajaku/aoba_johsai_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/book_report_rubric_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/38264898428.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/sijirezamewex.pdfIn PDF document text
    • http://wimarewixogax.epizy.com/favuxazajenemawutegumit.pdfIn PDF document text
    • http://wanalatuzukogax.epizy.com/90610641711.pdfIn PDF document text
    • http://dujofaxuro.rf.gd/filmywap_official_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/messenger_apk_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/amaze_browser_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/vejin.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_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 5012 bytes
SHA-256: d88540baa9bb51af5342cb805d42137509f2855ce174c933f4fb1ee404972b08
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 12872 bytes
SHA-256: 970d045e16e14f561873b5002efd99be711491f0e5d230a1f040dc61b8929722

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