Malicious PDF — malware analysis report

Static analysis result for SHA-256 484bef1dda6de5b0…

MALICIOUS

PDF

115.5 KB Created: 2021-04-07 04:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8c9c39333d2b87d3a9e3c4d9de6abe5c SHA-1: 594b18c185943fa7c6c19645a88c9770c89e33ca SHA-256: 484bef1dda6de5b05c72128c9e310448f07d8df8b595a003ad0257b29f922921
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. One of the embedded URLs, 'https://leonvi.ru/award?keyword=babysitter+application+pdf', is likely part of the lure to direct users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=babysitter+application+pdf PDF link annotation
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/50fcab6206267d.pdfIn PDF document text
    • https://wavuzujez.weebly.com/uploads/1/3/1/4/131406867/jubuv-xawasurugu-sebuva-misose.pdfIn PDF document text
    • https://tilivugex.weebly.com/uploads/1/3/4/1/134108965/juwapisamija.pdfIn PDF document text
    • http://gagerovovus.22web.org/satellite_antenna_types.pdfIn PDF document text
    • http://xadakid.22web.org/tata_sky_telugu_channel_number_list_2020.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/90780dea-5187-40eb-8e7c-0575cf7839d6/how_much_does_a_gym_membership_cost_in_india.pdfIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_303511286e7d4af687942a9c954e94b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de3ce57f-ee78-49ce-9be3-5ed0583a199c/gojomajalozule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22332cf1-a810-41d1-bd2b-400e65235d35/who_am_i_elements_periodic_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac8baa8-8c64-4fdb-899e-71c96f4d4bb5/85848689576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e42202d-3144-443d-972d-ee6293f6ae73/53915961668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf189c5-928a-40cc-89d4-d8b97ae23ca1/how_to_clean_crane_ultrasonic_cool_mist_humidifier.pdfIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_be8af1d1b4bf41fb9ec902f98cb38886.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5bc60f-591e-4586-8184-2eff5a483add/94639924738.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_10347eceea084422bf5744431d6448e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f952b0d-3ea2-427f-b945-82ca3bacdad4/powerwise_qe_48v_charger_troubleshooting.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_f41d9b0c246a4935bdf10a4c9c0f78a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99751d0-ea36-4684-a712-2d192b444dfa/82321860049.pdfIn PDF document text
    • http://mikafametulere.epizy.com/footloose_the_musical_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9cd9efb-5236-482a-9eb9-2be7e239aec3/where_is_the_filter_on_a_whirlpool_quiet_partner_ii.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_off00018a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A2A 5440 bytes
SHA-256: 2be4324ea69093ed77818c802a14ad221bc5bb85052e6261f08737421fc6fff0
font_01_sfnt_off00019cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CBA 10548 bytes
SHA-256: e8900e1735cf18a9b62e1b41e1791a175dd6aa6eb54cc18044c9af15414425aa