Malicious PDF — malware analysis report

Static analysis result for SHA-256 5825c65db6591579…

MALICIOUS

PDF

87.2 KB Created: 2021-03-28 01:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5e4953e8ea85cb2207d660a2d61844a SHA-1: c8e4b0f3c37f7bab23fb40c707a9e349d6d2d58b SHA-256: 5825c65db65915792597669f607220e6d50572c6d8ecc4db599a4e5b574ca59e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains a string that appears to be a lure related to a film title, directing users to a suspicious URL.

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://xezojetit.ru/strik?utm_term=watch+we%2527re+going+on+a+bear+hunt+film PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5ffc5f448f542.pdfIn PDF document text
    • http://testertumentum.space/31088438569t720v.pdfIn PDF document text
    • http://salea.site/vexoxatudonizorafake2y24b.pdfIn PDF document text
    • http://optamorem.com/braun_wheelchair_lift_service_manual5h05p.pdfIn PDF document text
    • http://update-win20.online/mackie_sr32-4_vlz_pro_service_manual9mbig.pdfIn PDF document text
    • http://mebelrostov.ru/el_caballero_dela_armadura_oxidada_capitulo_1_resumen_cortorbxd8.pdfIn PDF document text
    • http://plusstore.pro/chinese_symbols_numbers_1-108x1uw.pdfIn PDF document text
    • http://carinsusa.com/32657289224kv6bh.pdfIn PDF document text
    • http://icily.xyz/m-audio_oxygen_49_price_philippiness0qmg.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/91401983080u10lb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fed751015d35.pdfIn PDF document text
    • http://wuxifev.iblogger.org/momibaxoxusafal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_6015b9c4df596.pdfIn PDF document text
    • http://choosemadam.site/everstart_50_battery_charger_manual7vrcm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_605cdc6c9eb94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobegakolu.epizy.com/libros_de_bioclimatica.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/27205630930.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/36217909492.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/90673217892.pdfIn PDF document text
    • http://xijizofupe.rf.gd/what_to_use_instead_of_surface_pencil.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_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 5396 bytes
SHA-256: e7ff02e686861a5575489c80ca74fb6c236d74cf432bde3adec52bdb79e023a4
font_01_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 12416 bytes
SHA-256: 99ffa51c1015418868f19ae468f83c49b199b4bb8f40ebd3ed9132dc0a699531

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