Malicious PDF — malware analysis report

Static analysis result for SHA-256 983e240b6fb62a95…

MALICIOUS

PDF

75.8 KB Created: 2021-03-22 03:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 36f2e632edd5ab063efeb29c7090347f SHA-1: b04e05896d8891bd1caccd39252bdcf04f20055f SHA-256: 983e240b6fb62a95a13981418cc152b2ea2af7df7109e2ee0a2d9ad9e3ea3ad7
234 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to external URLs, one of which is `https://jacksth.ru/wix?keyword=illidan+novel+pdf+download`. The presence of a 'Password-protected archive handoff' lure suggests an attempt to bypass security controls by encrypting a malicious payload. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=illidan+novel+pdf+download PDF link annotation
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/2401867.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/RIgjvjj/58589227735.pdfIn PDF document text
    • https://manonerotorupu.weebly.com/uploads/1/3/4/6/134683358/sulex.pdfIn PDF document text
    • https://voxipomawo.weebly.com/uploads/1/3/1/3/131379395/veraweni.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/uVjfigj/jazolaso.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/fabixanifodofoxupo.pdfIn PDF document text
    • https://nopolojeg.weebly.com/uploads/1/3/5/3/135349815/loteraf.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/b59e90dc-acb5-4f21-8fb4-1c44e01f78a3/where_is_the_closest_mini_cooper_dealership.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_eb6bc9691785483ba4d1c7db50c5b8d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/153e0c70-4d69-4695-9477-e0a4d8c2e104/434157608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbba38fc-c310-4633-b7c7-ec3dda88e781/sccm_osd_task_sequence_log_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb921cd-5784-439c-a265-27fcd7362b8f/19885814179.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_e8365c38b1114ec6bbe25ecf3ce0236a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9712105-bdda-4d6b-b52f-eaf571e43d90/how_do_i_change_my_exergen_thermometer_to_fahrenheit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419c79d2-af79-4a7d-b495-9441d7685ea6/the_ascent_of_money_documentary.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_81a2c00fa94c40398c8b26330a7bd601.pdf?index=trueIn 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_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 4848 bytes
SHA-256: 8fe992fba81b8039cef5a634c5cee0ce0505163ada478b5d1306170d784cf4d2
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 10580 bytes
SHA-256: 4b1361ad8086a4f9e99ac3731a7c16f37e58f786e270da67c0ef08ee418b04b5