Malicious PDF — malware analysis report

Static analysis result for SHA-256 0290ac1c5b1eef31…

MALICIOUS

PDF

64.5 KB Created: 2021-02-03 00:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 997748710d39eba8856ae4dc8c954830 SHA-1: 2e7dd700606a666385dad8c7bd9668b13883dc81 SHA-256: 0290ac1c5b1eef31332aa995db3e32f69e8193a693164f8ab7bf7fc39366db32
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://leonvi.ru/aws?utm_term=grb+inorganic+chemistry+for+neet+pdf PDF link annotation
    • http://mandarin-fruit.space/de_roupa_do_cabelo_roblox_cdigosdi50e.pdfIn PDF document text
    • http://momsmall.space/sezepup0i5d2.pdfIn PDF document text
    • http://nikecortez.net/dasijaworiribotikizekz3vm.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/jhajhje/coin_pirates_instructions.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/kingdom_rush_level_guidefihub.pdfIn PDF document text
    • http://shop50off.info/gamegomidodujetodiridosmkb1m.pdfIn PDF document text
    • http://catsism.com/ratio_proportion_worksheetsjgmh2.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/Bhhhbd0/simple_notepad_mobile_hidden_camera_full_apk.pdfIn PDF document text
    • http://gnoogle.site/ghostrunner_ps4_gameplayd8rg0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bofiragomux.rf.gd/aneurisma_fusiforme_definicion.pdfIn PDF document text
    • http://bupujipa.epizy.com/96556356126.pdfIn PDF document text
    • http://mewexudidis.epizy.com/bemojema.pdfIn PDF document text
    • http://bewegemoketofa.rf.gd/lufaridazu.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_off0000bd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 5812 bytes
SHA-256: 07014e81f260a52f7a186e2dbddd55479c752c9baee5594de28dba96ba366442
font_01_sfnt_off0000d129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD129 10656 bytes
SHA-256: d6c53dc74ed6b692ca22b2c5d0d96d7babfe6f38d08d4f26ee620e2a4155901c

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