Malicious PDF — malware analysis report

Static analysis result for SHA-256 82855df0ebb63cdf…

MALICIOUS

PDF

81.0 KB Created: 2021-06-09 21:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2f26a628a335e99c94004ab1eb5b4100 SHA-1: fd5c1a2b5d64f1c4c902a724de5d744e72b77c6d SHA-256: 82855df0ebb63cdfb3bb94a320b67795b494660a4b272f119c2c91674ddc0718
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous external links, many pointing to disposable hosting, designed to obscure the ultimate destination. The primary URL suggests a lure for downloading software, likely a trojan or malware, under the guise of a game. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://coretry.ru/pbw?utm_term=resident+evil+2+apk+free+download+for+android PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4476941/normal_60b2f6de1ef57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_600e65e950ea1.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/729525.pdfIn PDF document text
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/d13523e9649c501.pdfIn PDF document text
    • https://vuxisiso.weebly.com/uploads/1/3/5/3/135321279/vevexutorolafit.pdfIn PDF document text
    • https://masizomomom.weebly.com/uploads/1/3/2/6/132681315/vuxoradigugej-wilikomiwemoni-vekarakiwoteg-dekodexitekufi.pdfIn PDF document text
    • https://jonolepazom.weebly.com/uploads/1/3/4/5/134520471/gitarekipuwuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_5fe8efcf8626e.pdfIn PDF document text
    • https://rofibefis.weebly.com/uploads/1/3/4/1/134131293/lusenalinex-fafedava-foxadusi.pdfIn PDF document text
    • https://zofiludel.weebly.com/uploads/1/3/5/3/135347527/pokodufeva.pdfIn PDF document text
    • https://limosajabug.weebly.com/uploads/1/3/0/9/130969130/5eceda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzimotum.pbworks.com/f/virtual_dj_pro_8_free_download_full_version__serial_crack.pdfIn PDF document text
    • http://jutopar.pbworks.com/f/pukub.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/simbolos_masonicos_y_su_significado.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144446628/96438750497.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/72117651658.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/buxenubenagazo.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/download_hack_app_data_no_root_apk.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144665862/r76.8_other_specified_abnormal_immunological_findings_in_serum.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144451113/how_to_calculate_half_life_from_graph_chemistry.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 5388 bytes
SHA-256: f049c3a39ff94db43e456207c1126e404bce6a456d2bb4f12ea669bb59bbba89
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 10564 bytes
SHA-256: 114cc9d2b39815615e49a0edfd06066ddf1eb9feec3fb06dbbdd59fa32ec91a5
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 16392 bytes
SHA-256: 6a4acb655a93af99c034fefb5cf629d98fc6daa8f4c706f013e0139d3a062ba1