Malicious PDF — malware analysis report

Static analysis result for SHA-256 a531c4b4c76c0d55…

MALICIOUS

PDF

83.7 KB Created: 2021-04-01 22:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6a8b6923adaf5e46f5fe9609b807ae60 SHA-1: e966b41d76ab07e140d9912a8931205608d74e5b SHA-256: a531c4b4c76c0d554918b0bfaf26c39753754125b2be6d1aa2ec07ca1b5e2eb2
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('botokaw.ru') that is likely part of a link farm or phishing scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, suggesting the document is designed to redirect users to potentially harmful sites. No scripts were extracted, but the presence of many external URIs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/wix?keyword=when+burgers+attack+level+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476275/normal_603188637355e.pdfIn PDF document text
    • http://kuzikugipitimiz.iblogger.org/accords_guitare_acoustique.pdfIn PDF document text
    • http://difijeso.iblogger.org/bbmp_tax_payment_application_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_604b3bd43e844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5fe9fc5e69945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457570/normal_6004e57485892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_605535431cb0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woxomog.rf.gd/9141484462.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_f9babffb6375488aa8f404e54fca87b9.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_702c9a35c26d4cae83f0447180ee070a.pdf?index=trueIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_6444e116c67b49348d887e22192ccb47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/rukanaponupaporo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216f0bb8-fdf9-4f86-aacd-77b37492b539/75899323119.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/sunijezijulinijilabosuduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c470305-8a81-442c-8da3-1c37529b3ce0/top_vegan_cookbooks_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/annexure_e_form_for_indian_passport.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_540d44764d9c479a85cc612f23b79ebe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b81c835-0632-435a-ac6b-f6fa4c925198/mumub.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 5492 bytes
SHA-256: d8afcc2421234f58aeb1ad8d2e356c580fc71af790c87b06953912af69b3430f
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 11276 bytes
SHA-256: fb19d8f84e01d9f2eda8690f5001b78b3116fd4042583c038c97aef78c23d670
font_02_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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