Malicious PDF — malware analysis report

Static analysis result for SHA-256 3324f82948645a5c…

MALICIOUS

PDF

81.0 KB Created: 2021-02-09 05:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 082a558654a43f2d5b5a5b014f1cb4eb SHA-1: 9d45386665fb180392335e2b1cc595b7a4608439 SHA-256: 3324f82948645a5c8299885eb604f532fc58e56da6365c52da1ffc463cfe60f1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

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://leonvi.ru/123?utm_term=ap+macroeconomics+final+study+guide PDF link annotation
    • http://tricitysikhs.com/457000376k9m9h.pdfIn PDF document text
    • http://pubguckazan.com/kurisi01gox.pdfIn PDF document text
    • http://nazhivy.net/jitokaligoqq692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_60137602c1d09.pdfIn PDF document text
    • http://santaparker.store/942190609065ours.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/jejenhi/bovugudiwovijoku.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/jgijig9/gun_sounds_ringtones_by_zedge.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/XNge2ia/rumble_in_the_bronx_jackie_chan_injury.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_601b976f64d84.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/pidbibQ/tonexilijonitorap.pdfIn PDF document text
    • https://cdn.sqhk.co/gupidiroka/NHvicjc/eastern_front_ww2_june_1944.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/jhTjcji/gravity_screen_on_off_pro_apk_full.pdfIn PDF document text
    • http://koteyarn.moscow/muponomejereto44e9u.pdfIn PDF document text
    • http://qrettalq.online/suridavumakaqzejg.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
    • https://s3.amazonaws.com/vawoginele/programming_abstractions_in_c_stanford.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_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 5448 bytes
SHA-256: 0e1a20825d77633dacd4cc05ae337fad2d7167e24454079ec3a0dd8a6edb2390
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 10668 bytes
SHA-256: b13464d60351343a64feb2cf77c7933f72b06977bf2ac614e11d16c93ef333ac
font_02_sfnt_off00012905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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