Malicious PDF — malware analysis report

Static analysis result for SHA-256 d427e824030ff499…

MALICIOUS

PDF

71.7 KB Created: 2021-03-23 19:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b9d9e4568f9052801b84d905f054ef91 SHA-1: 79754f81bce85cc63386b75826d62d60b754a51a SHA-256: d427e824030ff499624b4bd10a63a52cc79980d31b8dffa02afdc37e737540b3
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'botokaw.ru', suggests a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/123?utm_term=junior+scholastic+answer+key+december+10+2018 PDF link annotation
    • https://tubadelemifevit.weebly.com/uploads/1/3/4/5/134509228/77b2a69.pdfIn PDF document text
    • https://cdn.sqhk.co/virapazetif/ZXihhg1/rizanepuzegasaleg.pdfIn PDF document text
    • https://xepebujusu.weebly.com/uploads/1/3/4/3/134319702/kukiwujow.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/igJAD4Z/33701222228.pdfIn PDF document text
    • http://dlkmvkoenv.info/fingerprints_of_the_gods_bookqu8n2.pdfIn PDF document text
    • http://moreprodukti.com/full_dslr_camera_appy0drz.pdfIn PDF document text
    • http://pixelbarista.com/71018485589zwza6.pdfIn PDF document text
    • https://lujotasapamuxa.weebly.com/uploads/1/3/0/9/130969194/f278b73.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoxoxowex/cRhcTiJ/music_with_lyrics_for_studying.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/cC8uidb/21905141137.pdfIn PDF document text
    • http://afracheat6.xyz/antifaz_carnaval_para_imprimirve333.pdfIn PDF document text
    • http://rubyshup.space/how_to_use_teamviewer_step_by_step_youtuberadsv.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/57f89322-ce89-4b42-824f-535fb4ece92e/what_is_the_salary_after_ms_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5badcae-ae82-4b76-bc85-353c31c6fe52/why_is_my_samsung_fridge_ice_maker_freezing_up.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/74739586455.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/befumekisilobumuzofunegu.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/paburubuxolipobutakonepo.pdfIn PDF document text
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_edcd7a24b2c7444b83c40472490f4f11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2086618-5519-453a-9523-a8521bf99379/nirefikuda.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_86e1082db5e547f1b9cc1bbf01022915.pdf?index=trueIn PDF document text
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_e2c42b8fd75948248c3a2e6e01d531f6.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_f33111c86afc46c6b8205d7d33c2706d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zurovajij/android_tablet_for_sale_argos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d7d1b8-60e1-42bf-8f6d-54d5e2e72797/remains_of_the_day_book_characters.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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 6088 bytes
SHA-256: 1c47196f90d39511516e7e7f0877fcbd61e00af197e520782796fc17ff4adc0b
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10284 bytes
SHA-256: da3f72d3e84825cc2cdba4a4ee8dd33f7730bee7fefc667add0f8cf1c875e00a