Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c652a4ca7aeebbd…

MALICIOUS

PDF

75.9 KB Created: 2021-06-11 02:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 84b8f9dbce22e8e5c431e4b885a4cd36 SHA-1: ae8438c22bf0d1d6bfc33849b32f9fad98f6b2c6 SHA-256: 3c652a4ca7aeebbd61c946c5cfbeac25429089607971f781ece9c3afda6d2a72
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 0.9996

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://nomylo.ru/pbw?utm_term=relative+clauses+explanation+and+exercises+pdf PDF link annotation
    • https://zixafozete.weebly.com/uploads/1/3/5/3/135349102/a5eca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_5feaf27febf70.pdfIn PDF document text
    • https://wujemalevimovud.weebly.com/uploads/1/3/4/4/134470439/4507330.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/puzosepuzije.pdfIn PDF document text
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/a8cfb38.pdfIn PDF document text
    • https://kabawerabava.weebly.com/uploads/1/3/0/7/130774965/ada75a321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5fde1141099cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_6029a1e3b006f.pdfIn PDF document text
    • https://wapolamezabez.weebly.com/uploads/1/3/4/0/134041225/jukulosimel.pdfIn PDF document text
    • https://faboduvo.weebly.com/uploads/1/3/5/3/135343103/1662256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevetijusova.pbworks.com/f/how_does_rhythm_affect_a_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0688d2e-f7b1-4c89-90d4-3ec219151ae1/vajafipeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5066896f-7d0f-4f6b-8670-b7adec22add9/kutudasajevesuzezabeg.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144845943/pigatajirubabedopudunoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74835c8-68b6-4ecc-9c68-e86e7fef8763/mastering_machine_learning_with_python_in_six_steps_github.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/lepukobudovixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/864718a6-e520-45db-8556-84330ade07a9/icom_ic_718_service_manual.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/canon_mf3010_driver_windows_10_64_bit_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823a7671-f2ad-43aa-a19a-59ebf697fa86/how_the_grinch_stole_christmas_1966_streaming_reddit.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144488931/45683307236.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/25927202334.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_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 5284 bytes
SHA-256: 3ffdbfecaadc58762aba7593cda121f6a3b36717a114ce2dc5498d653c456122
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 10548 bytes
SHA-256: decdff191e013176658c7ebbf986efc28dfd988fc484c418d4a56395ae6070e1

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