Malicious PDF — malware analysis report

Static analysis result for SHA-256 82daf57ba52a04b2…

MALICIOUS

PDF

76.0 KB Created: 2021-03-30 14:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b0dbcd176afe22df365dd6f3ed68c185 SHA-1: 9f8c92d0f1b69817b8874ebe30e14400faccdda4 SHA-256: 82daf57ba52a04b2d7e0992493ecf97868c02fca37634cf0aaa6cf606a3407c6
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 0.9998

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://gimoguvi.ru/award?keyword=audacity+manual+pdf+english PDF link annotation
    • https://cdn.sqhk.co/lorotukogof/a70heNj/revenge_of_sultans_mod_apk.pdfIn PDF document text
    • https://papekukikaduli.weebly.com/uploads/1/3/4/3/134361343/c8470c87488.pdfIn PDF document text
    • https://gawujura.weebly.com/uploads/1/3/5/3/135325150/ddc3d19.pdfIn PDF document text
    • https://cdn.sqhk.co/sivojadirabe/hhgc4hf/34515628945.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/abFicV5/23892406106.pdfIn PDF document text
    • http://xidolamel.iblogger.org/como_convertir_pulgadas_a_centimetros_formula.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://cdn.sqhk.co/faxonudogot/gIjbjdF/trusting_god_jerry_bridges.pdfIn PDF document text
    • https://cdn.sqhk.co/livaxipovage/iWkhaf3/93225271487.pdfIn PDF document text
    • https://cdn.sqhk.co/lelitojo/LKhhhgg/tuxaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_5dcf099fbe954a56a7e3f96484d914f9.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_33c23c338b164aec9696e93353d4ac3c.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_9e465b5d1fed44faabd51646467bf7f0.pdf?index=trueIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/37161895062.pdfIn PDF document text
    • http://xolevusafo.myartsonline.com/noughts_and_crosses_book_download.pdfIn PDF document text
    • http://zemorenoduw.epizy.com/sultans_of_swing_solo.pdfIn PDF document text
    • http://megutid.epizy.com/reriju.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_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 5564 bytes
SHA-256: ae5b23c55e953321d16fd08b6a88563d5449e7fc0f20c943aa2691c41c75dd9e
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 10800 bytes
SHA-256: 1688ba7b8f08fc92422edb18ffb91c8447753bb19ca80bca0327dc3719928922

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