Malicious PDF — malware analysis report

Static analysis result for SHA-256 7655c93a8cb7499d…

MALICIOUS

PDF

75.1 KB Created: 2021-03-16 13:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27a1d662741b940c3d063456759930cd SHA-1: 23b961448efa8b515dd77dcb8f99e95c162cb4b9 SHA-256: 7655c93a8cb7499dfda41b33cb86b9697bc1c0b260cb1b88eda32b421f572c49
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically pointing to a URL that appears to be a lure for language learning materials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malicious distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://dafemum.ru/123?utm_term=bescherelle+arabe+les+verbes+pdf
    • https://cdn-cms.f-static.net/uploads/4426822/normal_601e99da80653.pdf
    • https://cdn.sqhk.co/marixefe/vVK0Ujd/nipedekumabu.pdf
    • https://cdn.sqhk.co/fakineduxafe/UghFcjg/mipimefuguzexufafab.pdf
    • https://static.s123-cdn-static.com/uploads/4464707/normal_6007ede797ecd.pdf
    • http://jedilinosur.mywebcommunity.org/tiwevizajatupivanigu.pdf
    • http://acupofjacob.com/9891878986cc1qy.pdf
    • http://foyou.store/fiwebifojezipegoxa8x423.pdf
    • http://basidugom.mygamesonline.org/48879009826.pdf
    • http://straponartist.com/under_the_banner_of_heaven_book0byo9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.fontrix.comhttp://www.nhncorp.com
    • http://www.daltonmaag.com/
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_9cb3e6ab1c8c440bb298542de770a7b2.pdf?index=true
    • http://buzanuziti.myartsonline.com/why_mary_shelley_write_frankenstein.pdf
    • http://wujagenak.atwebpages.com/adobe_reader_update_for_windows_7.pdf
    • https://s3.amazonaws.com/wujodibu/america_city_hd_wallpaper.pdf
    • https://s3.amazonaws.com/muwemivumazulax/85505472415.pdf
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_6f4e508fde3645a8b1a6437dd9fe5430.pdf?index=true
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e0.bin
fff1c055d05aba5b028b5e49daaddd94a277db052cdce7cc631db0bba9b012f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E0 4936 bytes
font_01_sfnt_off0000d4b2.bin
375768f5a8ec2bcd9a43565bd1dd05180fc4543eb32d5b45fae86a21f0cbf671		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 2092 bytes
font_02_sfnt_off0000ddbc.bin
1045d5e6869f0cc82a132357c89636779cf3bd4de6cacf6a733da83ac287f3c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 11792 bytes
font_03_sfnt_off00010452.bin
5050a2fc2fec91faa87c28fd4c1a3d9fb56ff55c2ab308fef09884f5acbec659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 2532 bytes
font_04_sfnt_off00010e87.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 4324 bytes

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