Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c28ce291197f24…

MALICIOUS

PDF

108.0 KB Created: 2021-03-02 22:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6fdf2f554368f026d4ccca30d8c45c61 SHA-1: 9bd70943fceace8be721826f903af69996ad33e9 SHA-256: 58c28ce291197f24c35bfb0b70e771e70a6508459b6d3ecf9263737531711ae3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'bologen.ru' which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, appears to be a lure related to a search query, suggesting a social engineering tactic to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=what+was+neptune+the+roman+god+of PDF link annotation
    • http://tuvivukaroj.mygamesonline.org/20069157708.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/interrogative_pronouns_worksheets_for_grade_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471091/normal_5fcf416e31050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_601255c3332b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_601ddeb42f9c7.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/what_is_abnormal_findings.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/96916139920.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/its_never_easy_to_walk_away_let_him_go.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/jitewuronuwojekiluxuwaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nabenejajoko.myartsonline.com/2003_harley_davidson_sportster_1200_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/93679247759.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/gisakuvivi.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/evenflo_chase_plus_installation.pdfIn PDF document text
    • http://gafodix.myartsonline.com/niebla_miguel_de_unamuno_capitulo_31_resumen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001582e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582E 5364 bytes
SHA-256: 1f4ca553e44916a8b26a79d59e56ec8c69e8732f436d7e4804187c9c6503e55e
font_01_sfnt_off00016a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A4A 14908 bytes
SHA-256: 1ce860ed64fbd8d13f544710cf7f8644d0727062d65a58fda0304d096590f8a7
font_02_sfnt_off000194d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194D3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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