Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa831ea8ac80896d…

MALICIOUS

PDF

67.5 KB Created: 2021-02-04 04:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a86efe9daa741910d151aca4d20a03ef SHA-1: ee4ebffabddbeb2f16da7590b626307be8d5a8ff SHA-256: fa831ea8ac80896d63ff5d281f86349bb4f28dee0c23bb317492cf64140ef4a1
226 Risk Score

Malware Insights

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

This PDF document is classified as malicious and exhibits characteristics of a phishing lure. It contains a large number of external links, many hosted on disposable domains, designed to redirect users to potentially harmful content. The presence of a 'Remote-support tool lure' heuristic indicates the document likely attempts to trick users into installing or connecting to remote access software, a common tactic for gaining unauthorized access or delivering further malware. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to exploit vulnerabilities or trick users into downloading malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=bahubali+naa+songs++hd PDF link annotation
    • https://cdn.sqhk.co/zisujidixa/jTtFgiT/teamviewer_quicksupport_free_download_for_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/moranunemuk/hjgggQO/lego_marvel_superheroes_cheats_xbox_1.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/eQjghjw/nidazumofabi.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/fcff39b.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/xawliif/ice_cream_truck_song_free_download.pdfIn PDF document text
    • https://nekusudowup.weebly.com/uploads/1/3/5/3/135315851/zotofa_zekejinise.pdfIn PDF document text
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/5683762.pdfIn PDF document text
    • https://pidakulosa.weebly.com/uploads/1/3/4/3/134391257/7730837.pdfIn PDF document text
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/8602333.pdfIn PDF document text
    • https://cdn.sqhk.co/riwajamugem/QJQ5jep/2404786443.pdfIn PDF document text
    • http://fefosawixamuwow.22web.org/bomber_jacket_template_png.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/TDHVgji/jimisakuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/incremental_reading_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/dudewenorabugux.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC851 5180 bytes
SHA-256: d8e5e1806b58b107f0e0fef6ac11006d75107de627ace427eadce3e0efba5001
font_01_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 11572 bytes
SHA-256: 8c8902e16ddc9ae6c3d446b01ee4dbbdd0afe37edee5405a4a08b54acb19b186

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