Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ab1105eddf257f…

MALICIOUS

PDF

76.0 KB Created: 2021-05-22 03:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 062a9564ffb6ad530d31f3a0ec54164b SHA-1: d737fb0f2d7927c30eeb75c2ae18907d3688b811 SHA-256: f3ab1105eddf257f520eac56e7e63cb4d6224092e7ed9f8178eb2fc929242514
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://kuzutuzo.ru/strik?utm_term=algebra+1+literal+equations+worksheet PDF link annotation
    • https://giderolimarova.weebly.com/uploads/1/3/4/0/134098849/5d85b91e8808f5.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/3261730f3a2.pdfIn PDF document text
    • https://wakokozetu.weebly.com/uploads/1/3/4/3/134307835/koroledogovoxu.pdfIn PDF document text
    • https://filewefoxu.weebly.com/uploads/1/3/4/7/134750201/6325484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_5fdc58e70b49a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fc7c8c694140.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/ffcb43e73782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5fdc0fb6dc9a8.pdfIn PDF document text
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/xujulakumo-nudorifan.pdfIn PDF document text
    • https://tidijutaxidekoz.weebly.com/uploads/1/3/4/5/134589823/370fd12fcdae2.pdfIn PDF document text
    • https://sosabugipos.weebly.com/uploads/1/3/4/6/134657522/gonoxetevufo_kejatusaba_gupim.pdfIn PDF document text
    • https://vamemaxodoj.weebly.com/uploads/1/3/1/4/131437173/5297525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_60210819470e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465709/normal_605d81d67f7f1.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/6b61e61f-fd9e-4cf9-9931-0b283f41e4ff/burobepemebevapafefokilor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f68ad5-e12e-4455-bc9b-f677b13eb497/sowonafivateleduzif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ebb8bbc-5e5c-4591-93f2-b1c726d0518a/robot_vision_berthold_klaus_paul_horn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129c6e53-710b-48b1-aef4-e11a156ec8c1/how_to_mind_control_anyone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c9122a-1a65-46d7-800e-3090ba6606f6/bissell_spot_clean_professional_3624c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ccb2b28-ab97-4653-9429-08ecbc1b0448/how_to_make_assessment_in_lesson_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22cd2fa-556b-4711-8d79-93c2b0232080/the_collector_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca9d4cd-0cf3-4e58-961a-30fe14207ee7/fopilawirib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c1fb2d-0365-4921-81a6-d164053ca6ce/nespresso_essenza_plus_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4802c5d-2604-4463-b3a8-9289c8bcd0bd/tacky_the_penguin_theme.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_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 5408 bytes
SHA-256: 8a47d51fe17f9dd097c6d1583de2310792fe6cd99271adb21f48b0b2a0ef348e
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 10136 bytes
SHA-256: f2cd6caae0738fcf7465aeef293660542927182819c46a4f49655b0b9077eb1b