Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f96026a3b96dcc…

MALICIOUS

PDF

73.0 KB Created: 2021-01-21 03:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fd478fa239802c34b964e57259b4b8ac SHA-1: db53a242da7f21541b79934b0b00ee5b1f4d3808 SHA-256: d9f96026a3b96dcca04202137b21323a9d721528ec12ad7571dad862324cdcd1
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external URIs, including one pointing to 'baarspo.ru', suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, and the presence of multiple PDF_URI heuristics confirms its intent to lead users to external sites.

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 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=cross+friction+massage+bicep+tendonitis PDF link annotation
    • https://site-1176460.mozfiles.com/files/1176460/free_marshmello_ringtone_offline.pdfIn PDF document text
    • https://site-1177258.mozfiles.com/files/1177258/6554602642.pdfIn PDF document text
    • https://site-1178836.mozfiles.com/files/1178836/azhar_movie_hd_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403814/normal_5ffbf4d3ea34a.pdfIn PDF document text
    • http://fomaxos.22web.org/39806223505.pdfIn PDF document text
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/1152774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_5fe9496bbe2d7.pdfIn PDF document text
    • https://site-1245443.mozfiles.com/files/1245443/wumodirepawas.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/e59a5b.pdfIn PDF document text
    • https://jazolesapixol.weebly.com/uploads/1/3/1/4/131453041/1238450.pdfIn PDF document text
    • https://site-1207400.mozfiles.com/files/1207400/rush_limbaugh_health_update_august_2020.pdfIn PDF document text
    • https://site-1195638.mozfiles.com/files/1195638/lezababutokisomatedavubi.pdfIn PDF document text
    • https://site-1185109.mozfiles.com/files/1185109/best_belly_dance_songs.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/laxijo_bemep.pdfIn PDF document text
    • https://nulixosur.weebly.com/uploads/1/3/4/3/134311840/63594eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413705/normal_5fd808223423a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukorow.epizy.com/wondershare_mobilego_apk_for_pc.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_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 5488 bytes
SHA-256: 7048b52cdd7fa41ce6cddb2791957265576e00e783b1ddf7500b5a3d75225ea7
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 10104 bytes
SHA-256: 7f05485be371efc7c65a62eefe9a2e9004b24ca45d9d0b548e6758bc6263b9bb

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