Malicious PDF — malware analysis report

Static analysis result for SHA-256 51288fb3420f377b…

MALICIOUS

PDF

71.3 KB Created: 2021-02-13 15:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 16d1311ec10e99becff3e374c557df8e SHA-1: 413fb2028d4b2c5fa689bfca08a6fccd110f59e7 SHA-256: 51288fb3420f377be1dfd851ab14b7a4cc039e242a469e191c806d975efd28af
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a large link farm pointing to various PDF files. One of the primary URLs, 'https://jacksth.ru/wb?keyword=crpf%20recruitment%202018%20online%20application%20form', suggests a phishing lure related to job recruitment. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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 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://jacksth.ru/wb?keyword=crpf%20recruitment%202018%20online%20application%20form PDF link annotation
    • http://sweetygirl.club/jopexizuwepokekuwuwojux4ib75.pdfIn PDF document text
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/sopasibazi.pdfIn PDF document text
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/2940585.pdfIn PDF document text
    • https://famopenagunabot.weebly.com/uploads/1/3/4/6/134688774/7998848.pdfIn PDF document text
    • https://dosogomufafana.weebly.com/uploads/1/3/2/6/132696174/40bff95ac.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/8755273.pdfIn PDF document text
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/5ab2863e158.pdfIn PDF document text
    • https://salotoniv.weebly.com/uploads/1/3/5/3/135305201/0ebb6f4a76.pdfIn PDF document text
    • http://gedoviduge.iblogger.org/film_a_frozen_flower_filmapik.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/835cdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_601aa009aa5a0.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/tetofamuxulil/cessna_citation_iii_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/financial_advisor_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/fire_damper_drop_test_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/jax_jaguars_injury_report.pdfIn PDF document text
    • http://sudolurimav.epizy.com/zokigofewobuson.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/vopiwitakuzum.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_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 5408 bytes
SHA-256: fc93eee00b22c5ab569fb73dca93642dc2948283313d02edf5332f08b673fb65
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 11476 bytes
SHA-256: 8ce964fab0cf7144a16486acecee3a375b250be25efde5a4a7c22db5dbfa13ab

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