Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9986c754280e64…

MALICIOUS

PDF

93.4 KB Created: 2021-03-24 05:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9e09c764e5bb67016108138ea26f13c5 SHA-1: fd7945a3835559a9d6ee7c167bf0464a76977342 SHA-256: 3d9986c754280e64830fc3c435b31a84aeb73887b7256c1aa056d18f5191c8e2
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vilenefex.ru/wix?keyword=birth+by+sleep+final+mix+100+completion+guide PDF link annotation
    • http://eurofamily.pro/35018048410yhyut.pdfIn PDF document text
    • http://xuridikak.22web.org/mudorobivimepa.pdfIn PDF document text
    • http://tigexesuni.22web.org/avenger_bike_image.pdfIn PDF document text
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/fupexat_zugosog_rotupofu.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/wojin.pdfIn PDF document text
    • http://merishwheelrecords.com/90798026967tuyo1.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/xuratozawelupigulasedax.pdfIn PDF document text
    • https://nenesezeli.weebly.com/uploads/1/3/0/7/130775424/4795785.pdfIn PDF document text
    • http://sreda.city/63477022552adu12.pdfIn PDF document text
    • http://bizbize-yeteriz.org/kublai_khan_southaven_msj1w7u.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/liles.pdfIn PDF document text
    • https://wuzitefagoxu.weebly.com/uploads/1/3/1/8/131856046/pararijage.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/vonuvidototenus.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/jubefutogifu_zadumirutijar_zonoze_vitewozofag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tixinova.rf.gd/kalirolo.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/can_you_eat_nuts_on_the_17_day_diet.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/how_to_deal_with_conflict_in_a_nursing_team.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/do_electric_hot_water_tanks_have_pilot_lights.pdfIn PDF document text
    • http://lukafimagog.atwebpages.com/nubuna.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/what_are_some_examples_of_the_purposes_of_patient_care_services.pdfIn PDF document text
    • http://pibunowawoxi.epizy.com/how_to_fix_sheetrock_corner_cracks.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/what_can_i_eat_on_the_master_cleanse_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/platform_ajay_devgan_ka_platform_film.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 5364 bytes
SHA-256: 82ecfcaba4d8b33706bd9dc82685aec3b0add4faeeb42e8b8c22933f83d24c94
font_01_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 6124 bytes
SHA-256: 871acf848319d6c9f9b93dce1f0e256fdce1c1f989aa7ac4665fb03eb8609d6f
font_02_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 14632 bytes
SHA-256: 821974651d2179a8c2ea344d4c8b1cbf7c80f3de70258babbf82f101cc6c1f0d
font_03_sfnt_off00013f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F59 11712 bytes
SHA-256: 475daf00aae792ab3c55f9633468496f7430c007dbb9f9cee841737d0fcc3114

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