Malicious PDF — malware analysis report

Static analysis result for SHA-256 600bf91a04e8a9a1…

MALICIOUS

PDF

72.5 KB Created: 2021-02-16 05:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 7cd861fd7829af54f3c4612b0026e506 SHA-1: cd4845d99019957c448d171c3f1bbd22627e2466 SHA-256: 600bf91a04e8a9a143824fae4c762865576a8ab0d26b1711a0533283449ec3d1
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, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or scam campaign. The document body, though heavily obfuscated, contains a reference to 'what is a dvr box for comcast', indicating a lure to entice users to click on the malicious links.

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=what+is+a+dvr+box+for+comcast PDF link annotation
    • https://cdn.sqhk.co/padixemugex/hdhh7m5/29625666536.pdfIn PDF document text
    • http://maska-respirator.com/taco_mini_bike_historyxum0p.pdfIn PDF document text
    • http://fresh-ita.space/cummins_m11_service_manual4tuvc.pdfIn PDF document text
    • http://appletopshop.ru/tana_mongeau_nip_sliph141t.pdfIn PDF document text
    • http://mazanatur.space/689142400074oyhd.pdfIn PDF document text
    • http://khareedforosh.com/47188883134shfsu.pdfIn PDF document text
    • https://lokuzovitopoz.weebly.com/uploads/1/3/4/8/134871506/raxurobapimo.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/jeheiaV/best_dual_monitor_stand_32_inch.pdfIn PDF document text
    • https://cdn.sqhk.co/tatakakuwito/dI0GbAf/20434884145.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/lovonapem.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/kogafuvebabopuykk.pdfIn PDF document text
    • http://batmbatm.ru/lopugulezolefupdd3w7.pdfIn PDF document text
    • http://myluckybet.xyz/casio_exilim_np-80_battery_charger9o1g4.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/25WsZgi/gravity_run_apk.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/5204182.pdfIn PDF document text
    • http://axecheat7.xyz/robert_edgerton_hasta_toplumlarjn5q5.pdfIn PDF document text
    • http://nonretloli.site/e_o_d_c_full_formos44s.pdfIn PDF document text
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/040b2717d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 5508 bytes
SHA-256: 32110fe0332bd691842016b7153c9d92034ded62f53044c023a9c3fb43d17a53
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 10660 bytes
SHA-256: 82bf44120519172aba647d175066b7830f70940b5874ec9fcd91f17961263046

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