Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a162cedd7b9901a…

MALICIOUS

PDF

75.5 KB Created: 2021-06-11 02:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e6adea950f6a9a1287f0b1e3f8892519 SHA-1: 6e5ad4edc834ac1d97470fafba66610fac3ccd36 SHA-256: 1a162cedd7b9901a58a806a74ef6759e7c0378f7afcb709a792a64b926e3abb2
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' lure and callback phishing elements further support a malicious purpose, likely to redirect users to malicious sites or trick them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/pbw?utm_term=alita+battle+angel+movierulz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388613/normal_6025da4ec54bb.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/zewabigenibez-siginawonu.pdfIn PDF document text
    • https://zivogozupitis.weebly.com/uploads/1/3/1/4/131406352/pakizibomeb.pdfIn PDF document text
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/momipe.pdfIn PDF document text
    • https://razijidepafex.weebly.com/uploads/1/3/4/8/134891772/xadalop.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/bepunaberi.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/waredajujedukod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_602e74a53497d.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/218a14d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_603831eba48a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedefoviraj.pbworks.com/w/file/fetch/144557772/household_expenses_excel_template.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/download_film_comic_8_casino_king_full_movie_lk21.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/20618119911.pdfIn PDF document text
    • http://javopurutoz.pbworks.com/w/file/fetch/144773079/81593218360.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/w/file/fetch/144775563/soxasatesa.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/can_you_have_a_venmo_account_without_a_phone_number.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144738450/mopinexuwosejosatopadipi.pdfIn PDF document text
    • http://gonikob.pbworks.com/w/file/fetch/145063764/91766121413.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144426531/17130423715.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_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 5068 bytes
SHA-256: 9151c42ddeeaa93bab7cc28bb1c269a7133541f70d3365b61e6d3be7ed03644b
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 10856 bytes
SHA-256: 59a4c97bf05c13de9065a63524f843585ebd97ef65ff295be2bb0f9a136f4a92