Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8803423e7ffb9e4…

MALICIOUS

PDF

108.5 KB Created: 2021-03-30 20:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7149185b033fa7b649831afd1adde531 SHA-1: 0b260e44b262afc767b6768a72415fd273720dd1 SHA-256: e8803423e7ffb9e46eb886e9665a1ef47e04bfeeec85e88186e233805ed01d96
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, presenting numerous external links, many of which point to disposable hosting. The 'Remote-support tool lure' heuristic indicates the document's content likely instructs the user to install or use such tools, a common tactic for gaining unauthorized access. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://cdn.sqhk.co/lebudawojafi/hjmLSjh/daniel_and_regina_call_video_download.pdf In PDF document text
    • http://lifupodez.22web.org/kikoxo.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/tratamiento_para_anemia_megaloblastica.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/jghhZhf/teamviewer_quicksupport_mac_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/7Xu5N6H/jufopapulerupukakafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448110/normal_5fdb69624c9f1.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/SZHmdgc/cat_warehouse_shirts_william_osman.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5fdd2a2ed27da.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/Ciggdjb/migaboleb.pdfIn PDF document text
    • https://baziwiruxufuwav.weebly.com/uploads/1/3/1/4/131482892/5575805.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/wggGgiy/bozipiluxopin.pdfIn PDF document text
    • https://cdn.sqhk.co/tavolimogid/gjfjbge/crowd_master_3d_apk_download.pdfIn PDF document text
    • http://jasetukuxazep.22web.org/83911861601.pdfIn PDF document text
    • https://wivezinafixozut.weebly.com/uploads/1/3/0/9/130969190/9641200.pdfIn PDF document text
    • https://tugigoboz.weebly.com/uploads/1/3/4/4/134499705/zokivu-daxejo.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/2icsDrU/64610825766.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://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=who%20were%20the%20clergy%20in%20the%20french%20revolutionPDF link annotation
    • http://vipiwimepi.epizy.com/jasper_report_table.pdfIn PDF document text
    • http://kemexulirejaror.rf.gd/funny_losing_it_memes.pdfIn PDF document text
    • http://siverudatowu.rf.gd/abandoned_full_movie_2019_free.pdfIn PDF document text
    • http://fabamej.rf.gd/99427141581.pdfIn PDF document text
    • http://kopixagelaje.rf.gd/autohypnosis_techniques.pdfIn PDF document text
    • http://zifasodokid.epizy.com/ecology_and_environment_free_download.pdfIn PDF document text
    • http://nilifujajug.epizy.com/xevufumelewumezitekuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001601a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1601A 4904 bytes
SHA-256: eff047c2ca37bb43ff4b3a13a277a10b5c95aa02970d730bd1ba07e5e449059c
font_01_sfnt_off000170ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170EC 11400 bytes
SHA-256: d25952efda66e25416a2bf4af743fdf6f42519ce6d563dc34921e6c14c650860
font_02_sfnt_off000195de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195DE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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