Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa86d893a071e6fd…

MALICIOUS

PDF

73.3 KB Created: 2021-02-25 12:21:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4e4f3cf099e934e9072a0540daa5ca4b SHA-1: 5e20b61a4be5a09399b79c8aeff69e25daacf86c SHA-256: aa86d893a071e6fd3227b78ac3b44f4f04faed81721fa4d4d6783ecedd8dc9e2
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, indicating a high probability of malicious intent. It contains numerous external URIs and embedded links, many of which point to disposable domains or link farms, suggesting a phishing or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to programming tutorials, likely to trick users into clicking on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=python+programming+tutorial+basic+advanced+pdf PDF link annotation
    • https://cdn.sqhk.co/zogowefu/nniesih/joroxatomize.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/jh4jd7J/this_means_war_lyrics_petra.pdfIn PDF document text
    • http://exampl1214.com/honeywell_t4_pro_programmable_thermostat_manualxbn8w.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/black_and_decker_weed_eater_st4500_manual.pdfIn PDF document text
    • https://wopuvonu.weebly.com/uploads/1/3/1/3/131384791/d71e4.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/97795824576.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/holt_geometry_chapter_7_test_form_a_answer_key.pdfIn PDF document text
    • http://goldenframecollision.com/island_park_apartments_reviewsvfh6j.pdfIn PDF document text
    • http://wei-nmvc.com/75807179632va5q1.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/iKF3DR7/7567531099.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/mirejegalidizaze.pdfIn PDF document text
    • http://masterpowerpoint.com/jimilrh61o.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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 5872 bytes
SHA-256: 33894346222cb9c6a90b50dbb860ef6a69d64132efadb743208845afc4107329
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 10232 bytes
SHA-256: ff8c52aa76e8b8eaf579b70b4413be8e2b90263cbe89050542efdb689af36b4e

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