Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfff86d0f3ff2e55…

MALICIOUS

PDF

93.2 KB Created: 2021-04-03 00:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a8641a4e77bb2a6e76862a4e8fc7184c SHA-1: e9b9b408ecabad50bb329d2ab6ed00c2fc8a302f SHA-256: cfff86d0f3ff2e55bccafbdb81f63b0e4476fa40fe47efb21e9b5e2768c17239
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to disposable hosting services, indicative of a link farm or phishing campaign. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick the user into performing an action, such as clicking a link for payment. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://botokaw.ru/123?utm_term=cbdt+payment+full+form PDF link annotation
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/1844653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5fd8a93e993bc.pdfIn PDF document text
    • http://berasowugixo.mywebcommunity.org/washington_capitals_schedule_2020_18.pdfIn PDF document text
    • https://fonixokud.weebly.com/uploads/1/3/5/4/135400654/sibizarut_buxakif_tipejizonu_sitatipuzazo.pdfIn PDF document text
    • https://zofumevovuve.weebly.com/uploads/1/3/0/8/130874077/fea800e3bf.pdfIn PDF document text
    • https://nigenodesi.weebly.com/uploads/1/3/4/4/134480521/6c7151f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416789/normal_6006fbcb4e2e8.pdfIn PDF document text
    • http://pemeturaw.iblogger.org/93309376986.pdfIn PDF document text
    • https://sufosuzupunu.weebly.com/uploads/1/3/1/3/131379650/torekapex.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/tider3j1re.pdfIn PDF document text
    • http://hayatevesigar.online/how_much_oil_does_a_mercruiser_5.0_takechjb8.pdfIn PDF document text
    • https://melesanej.weebly.com/uploads/1/3/1/1/131163783/2cfd3702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410988/normal_6059fbc2aeaa7.pdfIn PDF document text
    • https://pufenenuboz.weebly.com/uploads/1/3/0/7/130738511/452de83a8369eb.pdfIn PDF document text
    • https://kuratoso.weebly.com/uploads/1/3/4/3/134329811/7879775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_60640bd0c56bc.pdfIn PDF document text
    • https://vufoduvetuf.weebly.com/uploads/1/3/5/3/135302170/gidanoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zamizok.epizy.com/73158987848.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/school_certificate_design.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/rilupesiri.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 5108 bytes
SHA-256: a4cb493de68674ac7cbaf4f3b67774d5e07fa098e1b83a1fce60d39c0aa82ccc
font_01_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 11080 bytes
SHA-256: 2e8ce896a552da5ca0e07da62cb3aaebd6a08c19c0b2c37b4eb02544ecf52478
font_02_sfnt_off0001443b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443B 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off000158d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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