Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5624ccf454f0325…

MALICIOUS

PDF

87.7 KB Created: 2021-03-10 15:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4675173f82f0a80bb7a00b2c98a88a15 SHA-1: e82277684c49c469850a24f56ae048796a8b2bd3 SHA-256: e5624ccf454f0325608e37b6753ea8275dd861a0413b5d3d064fb79e3c394721
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous external URIs, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=der+bergdoktor+episodenguide+staffel+7
    • http://luzikudejijes.22web.org/61978152745.pdf
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/1169673.pdf
    • http://jugatilewe.22web.org/zosin.pdf
    • http://lududenikezijop.22web.org/beat_procrastination.pdf
    • https://cdn-cms.f-static.net/uploads/4498971/normal_602cf4071c75e.pdf
    • https://rugaxiloved.weebly.com/uploads/1/3/4/3/134305568/vipevajexibad-febavivujije-sabujikaridix-xowuvemasipu.pdf
    • https://cdn.sqhk.co/xanuramalu/4ZbUrlE/65976217334.pdf
    • https://cdn.sqhk.co/zejegure/cgfwiji/gusasivi.pdf
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/zovav.pdf
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/9180316.pdf
    • http://vzroslyh.net/2006_american_buffalo_gold_coin_valueg3uap.pdf
    • http://cuzinfo.ru/97220911011zz7q7.pdf
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fceb8599c2d8.pdf
    • https://cdn-cms.f-static.net/uploads/4445541/normal_601841e0239aa.pdf
    • http://lazerepil.site/letter_formation_rhymes_freee5wj2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nojemi/dapovuzupusut.pdf
    • https://s3.amazonaws.com/wutogugej/animoji_apk_duck_ios.pdf
    • http://lanuseponozowut.rf.gd/zezuvotefim.pdf
    • https://s3.amazonaws.com/gedexim/asp.net_mvc_dropdownlist_set_value.pdf
    • https://s3.amazonaws.com/jusagi/octonauts_colouring_sheets_free.pdf
    • http://nevoludez.epizy.com/scales_and_arpeggios_sheet_music.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b06.bin
e9d287a86c6260ba57690be569797c0aa4086246dd5dd73ab4e9309f13a0ca49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 5376 bytes
font_01_sfnt_off00011d63.bin
8e748d24517b61656abe74523f68909d8d2cab465f3b1c196b1061820b5106bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 11240 bytes
font_02_sfnt_off00014294.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14294 4324 bytes

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