Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c858fda5a8ded7…

MALICIOUS

PDF

68.2 KB Created: 2021-02-06 03:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fee5a71df8a9877d92bfcd185f705cf1 SHA-1: 4ab3c37ba3460fdc08d37765bb29d5036f4ac942 SHA-256: 64c858fda5a8ded7e206e860ad37a74d5dc7548038cce7d13c1775bab794b0d0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it may have been generated programmatically to host these 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://jacksth.ru/123?utm_term=big+stone+gap+va+restaurants PDF link annotation
    • http://fb-ig-violation.com/game_sticker_price_at_currency_exchangenulue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_600996401435e.pdfIn PDF document text
    • http://outputqwvk.space/91539043070or55r.pdfIn PDF document text
    • http://static-start.top/on_my_own_les_miserables_pianogp95l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_60154a1316a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_5fd0f739c2c84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nerusejide.rf.gd/xubukapovorufumuka.pdfIn PDF document text
    • http://kunizifafam.epizy.com/kelipibu.pdfIn PDF document text
    • http://zamonile.epizy.com/besame_mucho_sheet_nhac.pdfIn PDF document text
    • http://mamuzov.rf.gd/dushman_1971_movie_songs_free.pdfIn PDF document text
    • http://fuzimobikuxuta.epizy.com/66265140817.pdfIn PDF document text
    • http://lobosenus.epizy.com/worksheet_for_countable_and_uncountable_nouns.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_off0000cca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 5064 bytes
SHA-256: 4b8f68d426b9d921d701d1e2aaf5c2e41350cd704e698fc3318f2288d20d8265
font_01_sfnt_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 11492 bytes
SHA-256: 0c75eb0c0f70fdfcaa85b9e3f7826401fb0d9120825f1256ab43021928152dbd

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