Malicious PDF — malware analysis report

Static analysis result for SHA-256 7804c4647f5ffd8f…

MALICIOUS

PDF

85.4 KB Created: 2021-03-12 16:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a280a65fc73c2def7189448539448bc0 SHA-1: f04bd6f8a444bdae3d3f973a4f292246458de155 SHA-256: 7804c4647f5ffd8f6e76dea402560041e205b53a12da61bdecb2bf23ece2e090
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to 'manual cash book examples pdf' and the authoring application 'wkhtmltopdf', which are likely used as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://jumiwimov.ru/award?keyword=manual+cash+book+examples+pdf PDF link annotation
    • http://depusapo.mypressonline.com/33531121440.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/how_do_you_get_agile_certified.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_60226a2ff0e6f.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/98257471583.pdfIn PDF document text
    • http://sdfafq.info/fikoburovimosfbyom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445128/normal_5fcccd6610560.pdfIn PDF document text
    • http://daddytestit.xyz/77040852759tsh6q.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/3986323352.pdfIn PDF document text
    • http://help-violation.com/best_buy_slim_christmas_treeskym31.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/que_significa_fotografia_aerea.pdfIn PDF document text
    • http://libralab.digital/sunforce_solar_motion_security_light_1500_lumens_manualqeesd.pdfIn PDF document text
    • http://ductsunlimitedins.com/mustang_owners_museumir7uh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403807/normal_5fdfa935984a1.pdfIn PDF document text
    • http://easterthjg.com/71631763591momzu.pdfIn PDF document text
    • http://ygrash.website/cessna_337_super_skymaster_service_manualgodsw.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/987f36d2-5a55-45c8-a144-c9a021e1cee3/52411250131.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/ancient_mesopotamia_map_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dc7779-d286-45f1-a4a3-453b08b3e4f8/sivazod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80959ac5-c8a5-4b55-bff3-d3fc3400a3dd/how_much_is_a_2020_camry_se.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/formation_chaudronnerie_industrielle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c156af2-4ffa-4cd1-93ea-1b02bbaa682e/excelsior_college_lpn_to_rn_program_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/telegram_messenger_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/darile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33185ad9-209c-4a3c-9d88-c242ae9a4a03/91637136435.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_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 5576 bytes
SHA-256: 5b60a5cf575f7cc38579014cb34520f263679c1ecc07da3b12e8c1176561b2af
font_01_sfnt_off0001223f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 11284 bytes
SHA-256: 762650dd43bd7c7045e64b6ae835b0923d4ed30953272511238221e430586898

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