Malicious PDF — malware analysis report

Static analysis result for SHA-256 613b89343b238bde…

MALICIOUS

PDF

94.0 KB Created: 2021-03-18 02:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cd283a8143823e516fe466a81a5376d5 SHA-1: 94d9ef09fbbdaf68dd8764f2bdd96bd1486287d9 SHA-256: 613b89343b238bde2a4442c51311affdc9ec88670220ea8e2a5066ba8a2c298c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://midufefew.ru/strik?utm_term=why+antarctica+is+the+coldest+place+on+earth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444638/normal_604056bd324c5.pdfIn PDF document text
    • https://cdn.sqhk.co/tipapija/mhjgfjd/kung_fu_techniques_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_603e6f48a18ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_604cfedd720c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_602ee409bfa1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_602ab8d815d7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446034/normal_5fe45bb5d1da9.pdfIn PDF document text
    • http://senaxemuj.iblogger.org/mindfulness_journal_prompts_for_high_school_students.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/drM3Thb/jozuzuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486051/normal_60188b333ee2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fexewagesulel.epizy.com/dclaration_cession_vhicule_remplissable.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_d5bc7174895b4be79abb620af87ab942.pdf?index=trueIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_563e95564b7f4c73ac7609b030aa2197.pdf?index=trueIn PDF document text
    • http://simipibenafar.epizy.com/ladekedunumiwugupuz.pdfIn PDF document text
    • http://venakato.epizy.com/rifejinedow.pdfIn PDF document text
    • http://gajovab.epizy.com/26303863957.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_1cffd4e524b34df68fb9d9f130f22f3a.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_0a7c73226cf6492586e98400bd37fda7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 5064 bytes
SHA-256: 24130d5ad7404f6a4d63352a5a8b2884b98a462d9768af4113fe1d845a212a39
font_01_sfnt_off00013628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13628 11532 bytes
SHA-256: aace8b7af145c42bbf64b1e3bc7e3cbcdd40a661e6aefd730e0829899590d016
font_02_sfnt_off00015c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C84 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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