Malicious PDF — malware analysis report

Static analysis result for SHA-256 7052abc10d428404…

MALICIOUS

PDF

75.5 KB Created: 2021-02-25 11:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f48c258f4001d627a2f1a9b3a9a39e97 SHA-1: aa0a363ac289289e1e0fd65cab24827974a11f8b SHA-256: 7052abc10d428404891785e52095cdaf9279f880483dd4def28fadf1c559e41a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains a URL that aligns with the malicious findings.

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://baarspo.ru/123?utm_term=what+did+the+missionaries+of+charity+do
    • http://esclub.pro/72611048994ude96.pdf
    • http://anbieterbewertung-autoscoutch.com/city_fighter_vs_street_gang_apk_modz5d6b.pdf
    • https://romizipomubem.weebly.com/uploads/1/3/0/7/130775952/jozeridexijozokaj.pdf
    • http://confirmyourverifiedbadge.com/whatsapp_app_free_old_version_2015771nj.pdf
    • http://debopuforu.22web.org/same_love_violin_sheet_music.pdf
    • http://scotiaenlineape-personas.com/71216375640w9322.pdf
    • https://cdn.sqhk.co/fekigimuzib/hdhbige/62947772210.pdf
    • http://proita.fun/3035521208487goq.pdf
    • http://price-list.moscow/toilet_runs_intermittently7q4x3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dexidije.epizy.com/19441286486.pdf
    • http://migozojejaga.rf.gd/49757270293.pdf
    • http://banobozibijur.epizy.com/diabolik_lovers_manga_espaol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c4.bin
50d8e1665e61dddc196c0cb629b47fb0eece08193b5c8898cd8710dda5a93b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 5344 bytes
font_01_sfnt_off0000fbdb.bin
9631502182b0f7f9fd8a85511fd6bfa3cecdcc70a3e6390ee076168cdb8e33c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 11100 bytes

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