Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a39ca90e22b000c…

MALICIOUS

PDF

82.4 KB Created: 2021-03-20 19:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 226f2973be6d2b30e5a028f48116e92d SHA-1: b77339ddaaea8afa97ef90d567d90dbc9b2a42b0 SHA-256: 3a39ca90e22b000c2461fe5fa0d40db08b31453782ab689ebc2c583b55bf0081
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is characteristic of SEO manipulation or a phishing campaign designed to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://lozipotod.ru/award?keyword=4to+convenio+de+ginebra+pdf PDF link annotation
    • http://gifinibufenatar.medianewsonline.com/21695379876.pdfIn PDF document text
    • https://savaxibinis.weebly.com/uploads/1/3/3/9/133997587/fface425f.pdfIn PDF document text
    • https://xilivixawigilu.weebly.com/uploads/1/3/4/6/134672458/50a1bfa8f.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/ijhhjfL/dugumupijumezolesar.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/565e791f579.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/planos_de_casas_modernas_gratis_en.pdfIn PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/nifudidunotawopuxuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/otKcB82/idsa_candidiasis_guidelines_2009.pdfIn PDF document text
    • https://digojumowixev.weebly.com/uploads/1/3/5/9/135989627/xazuvatume_fodawepokalipiz.pdfIn PDF document text
    • http://wabixekere.iblogger.org/affairs_cloud_current_affairs_january_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/jijfijh/8380841193.pdfIn PDF document text
    • https://cdn.sqhk.co/rovujesox/ijuXjdC/90682908674.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/cd07243e-e728-43b8-a460-6b77a80f03cc/the_heirs_2_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d82cf7-c81a-4b52-a2af-bf74c5585d95/actividades_de_palabras_agudas_llanas_esdrujulas_y_sobreesdrujulas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb82817c-6ab0-4614-9716-05836dc689dd/are_amana_air_conditioning_units_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7d7c6c-232a-4240-86c6-a88befbf22dd/27382415914.pdfIn PDF document text
    • http://tupikodufalapa.epizy.com/costa_rica_itinerary_14_days_lonely_planet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/821d5eb9-e97f-4edf-8caa-eecd47eb767e/snow_white_and_the_huntsman_soundtrack_florence_and_the_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2dda2d0-7572-4e08-91ad-9501e2b2337e/mokutuwenobale.pdfIn PDF document text
    • http://gizimup.epizy.com/12955318893.pdfIn PDF document text
    • http://pirafabitibabik.rf.gd/how_to_change_your_address_on_nc_drivers_license.pdfIn PDF document text
    • http://siwebojik.epizy.com/20784408356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26804ead-b666-47e5-8b7b-6b332247a956/what_services_do_mcdonalds_provide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f031137-89aa-4441-8a06-8ef317a77c0f/tewutakamotanedosagize.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/ruvenepigisafuzan.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_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 5304 bytes
SHA-256: efd0b2177d42d265d6a9c40a70b1985c459bf5eab23a5e925a54972308438a4b
font_01_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 11540 bytes
SHA-256: 2c7ccfa4848bb27f183f789453e2eb65507561e6f0ed098e6129501465f3cc0f