Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d49c188be00fdfa…

MALICIOUS

PDF

78.0 KB Created: 2021-03-13 15:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 79185900c81e8c893a0f21c8b7df705d SHA-1: a2e6365cd0a8b7478ef947c9b86d3da3801755c9 SHA-256: 8d49c188be00fdfa4eb879c4df6ac1051df251bb6518309302e305f8ef60bbb1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a technique often used for SEO spam or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=atomistique+et+liaison+chimique+exercices+corrig%25C3%25A9s+pdf PDF link annotation
    • http://zobevewobuka.22web.org/94690927502.pdfIn PDF document text
    • http://nubidatum.22web.org/21359407951.pdfIn PDF document text
    • http://zubosoxi.22web.org/25984590036.pdfIn PDF document text
    • http://wexixexebasober.22web.org/adobe_photoshop_cc_2015_camera_raw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_26e249d3242541d7a106b5a04f8f6b62.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_6b8004c8ae4145b895ca95ce0f743474.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0acb07-16e0-4afd-a3b2-54aeb7e2d24c/completing_the_square_formula_quadratic_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e31f393-1e95-41d9-9954-4e27080cf83f/49379135978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5c8415-ab7c-4e20-a01a-78e7eabc9dd6/hp_elitebook_8560w_i5_specs.pdfIn PDF document text
    • http://fegubitexore.rf.gd/how_to_celebrate_advent_at_home.pdfIn PDF document text
    • http://gisudaledusuroz.rf.gd/acidosis_metabolica_neonatal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7a425d-030c-44af-86f0-e6aca6d36491/toro_wheel_horse_parts_list.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/arkab_el_hantour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14dc5db0-6a7d-40fe-804a-4553ee2edd8c/tubefitabujuxebu.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_405fc475e89b4c108f2d62b17e947ab1.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_4b3a54ca3d4e403fb35c895dbc64f3d8.pdf?index=trueIn PDF document text
    • http://ludinezew.rf.gd/how_to_attract_your_twin_flame_faster.pdfIn PDF document text
    • http://poxizaxo.epizy.com/mofinumomigaburosapire.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/skyrim_creation_kit_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ac8de3-b9c9-4d90-9865-b49c52945833/how_do_you_clean_the_oreck_xl_professional_air_purifier.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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 5896 bytes
SHA-256: b4f1c29af6eb0c54cc3fedb4cdab4bbe68eea8188937ef09e622dbca25876d7e
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 1640 bytes
SHA-256: e70fd494270c69eb4370f0cf58b2034df71703022c85fcb011ce92908277d061
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 13136 bytes
SHA-256: a0bafcb5187208542b695438665e33439eaf47acc1795ba3b8b5b44a726b6852