Malicious PDF — malware analysis report

Static analysis result for SHA-256 466cc1e0242e3eb0…

MALICIOUS

PDF

77.4 KB Created: 2021-03-12 05:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e3be97d40cef167d25e069d6c42d8750 SHA-1: 4d739478522ba7991a3fb2e703081779b8d1dadc SHA-256: 466cc1e0242e3eb0d369fb99ab64634fcdf26519c476126540731473e648a5ca
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though truncated and obfuscated, appears to be a lure related to educational content, likely to trick users into clicking the malicious links.

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://zajinet.ru/123?utm_term=math+worksheet+for+2nd+grade+pdf PDF link annotation
    • http://toolsbestpricemicrometer.site/belkin_n600_db_wireless_n_router_firmware_update2xnho.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489724/normal_60021d95b9ff0.pdfIn PDF document text
    • https://putatenuweza.weebly.com/uploads/1/3/4/6/134669031/8d9168ed1c5e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5fe0261883bb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418167/normal_6008e2cf13d53.pdfIn PDF document text
    • http://datingdate.site/ms_access_2007_bangla_video_tutorialgvlqm.pdfIn PDF document text
    • http://mavpa.fun/18577284228wtxff.pdfIn PDF document text
    • http://nazhivy.net/zuruzepotifu8sbbw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_60418c08dd3dd.pdfIn PDF document text
    • https://pubepisun.weebly.com/uploads/1/3/4/5/134594909/kitemezixirux.pdfIn PDF document text
    • http://jilet1.club/splashy_fish_storesgsk1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_6021f8607439e.pdfIn PDF document text
    • https://ruwagifixub.weebly.com/uploads/1/3/4/0/134013037/1a252bd05ea5e00.pdfIn PDF document text
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/5748779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5ffd1ad7d96f7.pdfIn PDF document text
    • https://binujoxejixisov.weebly.com/uploads/1/3/4/1/134108892/665d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464996/normal_5fca086497aa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5ff26034c5167.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/fivesi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_05a415fc53ce443da19080815c4eb1c9.pdf?index=trueIn PDF document text
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_ac27e64379c34560b049b78d8e9281eb.pdf?index=trueIn 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_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 5564 bytes
SHA-256: 40baed86fc18e15644c7b9236f5a5bbbfc5c5e6e03eb09fe225b0337ef39d97c
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 11152 bytes
SHA-256: 662269d0fe69c6a165007ce517b0f85f7e3a39498430bdd10903f6442419845a

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