Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c208247726db73…

MALICIOUS

PDF

83.7 KB Created: 2021-03-29 14:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 369a19f52bbf8538188a2e6c118b268c SHA-1: 41039d12bc9ac0b7048535ce7404ab98cec767e2 SHA-256: c0c208247726db73b6eb1b4f38a8df9b786a418ce10556bb92dc4859034af4ef
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as search result lures, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://leonvi.ru/award?keyword=loi+binomiale+exercices+corrig%25C3%25A9s+1ere+s+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369516/normal_601f80962e876.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/sagavegetur.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/libro_angeles_y_demonios_gratis_en_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490934/normal_6000a4cfdc821.pdfIn PDF document text
    • https://fiwofufoneronup.weebly.com/uploads/1/3/1/0/131071066/4790309.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/atresia_intestinal_2020.pdfIn PDF document text
    • https://tikofasej.weebly.com/uploads/1/3/4/6/134615027/cd9f94a117.pdfIn PDF document text
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/vudugowivev-jeluw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_60009e6ab0b50.pdfIn PDF document text
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/kibef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_601a015612544.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/gakufolovolojibuju.pdfIn PDF document text
    • https://faniwavuguvupos.weebly.com/uploads/1/3/4/4/134478403/lekugetav_xoveb_redaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_60300a4b17584.pdfIn PDF document text
    • https://sonefuvik.weebly.com/uploads/1/3/4/3/134325549/nofumubakiveroti.pdfIn PDF document text
    • http://pusovemolexed.scienceontheweb.net/dulirobuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/99851aed-550f-426b-ae81-18f645eb70d3/lincoln_electric_welder_140_hd_weld_pak.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/51274714179.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/449040189.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/afeias_app_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c96226c-514e-44b4-b4c9-9b9b7cf4e099/zizuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdbe66a-acec-4e22-9b08-93aca58089e8/bebekagunatekamogijesamuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2882ed2-1034-41fd-a472-636bfd7f38e4/segepa.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_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 5820 bytes
SHA-256: c5f106c4ea166f2c86891625a6632ce12f0a4f9173322a28cb2b7c21e92a1506
font_01_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 12996 bytes
SHA-256: 649e0ed4ee5f7823f88111bc5eb833bc477a29d7a8e4b0aa190184b029a13edb
font_02_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 16248 bytes
SHA-256: c89cd4610e7ad6cabf04f9876a36b22b5c31ae53dba02aeaa1b4677657537330