Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e3661198c92a73…

MALICIOUS

PDF

73.0 KB Created: 2021-06-10 22:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad6339bea71e13680e52144d8f183688 SHA-1: c8e44bd6f7f1c2f3509641f45aaa3ab1854e7dde SHA-256: 22e3661198c92a732202b9a27697c32e54f1af086a48be7def2b2be8e37aaebe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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 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://laborke.ru/pbw?utm_term=download+jhm+tech+frp+unlock+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5ff35e3a2479d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_606b2b4453119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_601ff2b097c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_604699ff8ee4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463298/normal_6003eaa5ac2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_606216f7cb626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_6041844cbfba0.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/95300078-9f29-4b4d-923e-efb19565c56e/lorenaxigexajin.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144702009/38586974770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4853b6f9-9a20-4577-96e2-1a494735c830/how_to_replace_pull_cord_on_homelite_blower.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144670407/32991214264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b47f28e-ca4e-4b71-a121-8e00690efbbf/15333298732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339fe148-62ff-4c2f-b8b7-6da527f42146/9945200250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14fd5365-3506-48bc-9e95-ddb1abb7d29f/dakugotowamizij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159ee7ba-393e-476f-aa87-57c103ae056d/poxixaraxamujofuz.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/f/25129014432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046608b3-b403-4708-84c3-7d08c5c63a30/brother_hl_2040_toner_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daace83e-9b2a-4706-a51c-8530053b9a27/64324608737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7eb969-7e03-48e9-a382-37a037598b24/40405838538.pdfIn PDF document text
    • http://zeranagaro.pbworks.com/w/file/fetch/144851970/23001012391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6122d76-f550-4868-86b8-771d024a10db/how_to_interpret_ekgs.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144838515/xipodigazezewupigipug.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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 5448 bytes
SHA-256: 4a122cab193edba88cc6049cce9fb14f380909a8838f1fcf5722e96a04b34cef
font_01_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 11000 bytes
SHA-256: 7ac70f866f2c1d8826e44de79d35f03fba1d847b17256688d3233d1468f46aa6

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