Malicious PDF — malware analysis report

Static analysis result for SHA-256 a799085eaa29c058…

MALICIOUS

PDF

61.7 KB Created: 2021-01-15 08:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ba3d27a2372014308f24f46da280045f SHA-1: edeb94ff3c86f3da76b3568e7d1932cdbc65be23 SHA-256: a799085eaa29c05883f9c8230d779e5e90e848d1524492095aa98b0ec3841ffc
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/123?utm_term=reingenier%25C3%25ADa+de+procesos+de+negocios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461751/normal_5fb4c51355e3c.pdfIn PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/pixel_buds_case_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/6Dhab9m/damoboxazapuso.pdfIn PDF document text
    • https://site-1181045.mozfiles.com/files/1181045/pepper_s_italian_restaurant.pdfIn PDF document text
    • https://site-1173730.mozfiles.com/files/1173730/automobile_engineering_project_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_5fba95eee225d.pdfIn PDF document text
    • https://site-1173572.mozfiles.com/files/1173572/mulan_flute_sheet_music.pdfIn PDF document text
    • https://site-1176728.mozfiles.com/files/1176728/mokekidolitago.pdfIn PDF document text
    • https://cdn.sqhk.co/wekajibex/geYKijf/xalifogoladomavo.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/cL0whf7/samsung_super_slow_motion_camera_apk.pdfIn PDF document text
    • https://site-1178182.mozfiles.com/files/1178182/ironing_press_for_sheets.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/dotivaf/parents_guide_the_girl_on_the_train.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/bahubali_movie_mp4.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_off0000b3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DB 5272 bytes
SHA-256: 0958c4695c19f59d9852d0c046ce36f716004b8f3f810ddf55323154a66088bf
font_01_sfnt_off0000c5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E3 10316 bytes
SHA-256: 332932790d592632c075885057b5b14280cd3701ce1b16d4ccec5f3195c772d4

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