Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab6273ca8c8e169…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 14:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: be0a2a4711cf1dfef884468d36901482 SHA-1: df5d125335aa583adb3b50afe0ffe15043a04169 SHA-256: cab6273ca8c8e1698eed46efdaa17b97b78d6b6c614838b8dc582a9a864e86a2
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. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or content-redirection scheme. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, but no clear instructions or lures are discernible from the readable portions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=como+nao+descascar+a+pele+queimada+do+sol PDF link annotation
    • http://kopogaxepaku.sportsontheweb.net/refrigeration_and_air_conditioning_technology_7th_edition_lab_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387826/normal_6005f3a4df868.pdfIn PDF document text
    • https://selijejexo.weebly.com/uploads/1/3/0/9/130969160/6244458.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/iphone_5s_instruction_manual.pdfIn PDF document text
    • https://tugemizibu.weebly.com/uploads/1/3/0/7/130739278/xuvimubag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_6007d64a2a75a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_60374caf2ef4d.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/lydia_davis_break_it_down.pdfIn PDF document text
    • https://cdn.sqhk.co/tonufipu/igAiahc/cross_the_road_frog.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/ghrhdKI/ticket_to_ride_beatles_tribute_band.pdfIn PDF document text
    • http://difanitukovu.mywebcommunity.org/54774279511.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/how_to_break_marital_delay.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/ausencia_de_cuerpo_calloso.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/jaii5HW/las_vegas_national_park_pass.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450242/normal_60097867c4bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5fd1109ed8a79.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/KjXQgcq/1687845085.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/kjhjddH/suvebosoxoki.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/fizufapu/linen_chest_bed_sheets.pdfIn PDF document text
    • http://faxevimisosideg.myartsonline.com/abordagem_sistemica_psicologia.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/jira_api_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/89579459673.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/59128284928.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/consort_diagram_guidelines.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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 5252 bytes
SHA-256: 0e64acf323d3265a9088893defe1cda732352f3f269e9cef94972a18f88ff2bd
font_01_sfnt_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 13244 bytes
SHA-256: 8c424775ae11a94424d4e556251df4ced9e4c7213720ccafd44b064b568f0769

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