Malicious PDF — malware analysis report

Static analysis result for SHA-256 833bae89d6db6983…

MALICIOUS

PDF

73.6 KB Created: 2021-06-11 03:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a61ae5d13030e9d1e4fab85f52357b19 SHA-1: ca765ac913d7abf5ca66b36d9eade8951c56aeb0 SHA-256: 833bae89d6db69839a577ba352e7ca0e7c0ff216dc76edef832bb99412fb20b2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, and it contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded URL and the primary external URI point to sites that are likely part of a scam or phishing operation, potentially related to scholarship applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/pbw?utm_term=motivation+letter+for+scholarship+sample+doc PDF link annotation
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/bejin-sudinuke-musijivutoriro-datanusegitax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_6032be0585dda.pdfIn PDF document text
    • https://sipekenatevare.weebly.com/uploads/1/3/4/7/134776107/jejonekediwimorofat.pdfIn PDF document text
    • https://jimoporifu.weebly.com/uploads/1/3/4/3/134378689/6cba3b4c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_6023d1026d8e2.pdfIn PDF document text
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/mekuxagovajam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fe90b07ccc76.pdfIn PDF document text
    • https://wuvepadin.weebly.com/uploads/1/3/4/7/134714831/gadawalifipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_605bf13eec5c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_5fe707d142802.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421215/normal_5feb8bf032c7a.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/48e0eb67-2817-48ca-b6e5-1e615f281a7a/development_through_the_lifespan_free.pdfIn PDF document text
    • http://fixiguru.pbworks.com/w/file/fetch/145055007/78639494494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f059d1-075a-431e-8da2-6ead17e6d3c9/ladomabagagerubivelujenil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88427b05-e071-45d9-9364-43c9463d2b83/aircraft_maintenance_engineering_colleges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5155bb9b-0028-4d10-8df9-abf1d5d3cbb7/37225268973.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144686709/bexorivulugeboxamelizobe.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/145058190/94693824347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d206ede-804d-4249-b01b-e935d7e4c2d2/78794413859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0001f0c3-e0e7-48a5-b526-bd08be010fb2/5080107449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f6bc72-69ad-4b19-9192-38ebb08dfe44/56147272823.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/145040559/harry_potter_and_the_chamber_of_secrets_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29afab0-4d87-4cc2-b724-06dff8822323/95997221766.pdfIn PDF document text
    • http://gejigavowule.pbworks.com/f/97340227330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f628934-adbd-478f-a3f4-d327a88b8401/example_of_a_positive_behavior_intervention_plan.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_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 5460 bytes
SHA-256: 235f93be6a393ff05182b0919e484c05e1ef722b8a8fb630b4617ce409f42243
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 9872 bytes
SHA-256: ad9c7f430668d481cae3c4484dea68da52423086273c531b42a7f4c97a5c9efa

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