Malicious PDF — malware analysis report

Static analysis result for SHA-256 8836f871e55120ec…

MALICIOUS

PDF

77.1 KB Created: 2020-11-16 15:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 23af11b1399578656eb5d6e32573d600 SHA-1: b22b97aef5561263a3bae1eec39e9abfbf952c49 SHA-256: 8836f871e55120ec8643ec54bd7cc510c1795a790899fb62db15de4a2dab19f7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many of which point to external PDF files hosted on link farms, a common tactic for distributing malicious content and evading detection. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead the user to a phishing or malware download site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=stick+wars+strategy+guide In PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/4263c55.pdfIn PDF document text
    • https://siwinapevaz.weebly.com/uploads/1/3/4/3/134338690/bobilofafebam.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/3338192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5fa32ed7a6713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5fa96f2211028.pdfIn PDF document text
    • https://varemajog.weebly.com/uploads/1/3/4/5/134585454/b69f3fd.pdfIn PDF document text
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/9dd40.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/711678.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lunojol/clicker_games_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/jabenudewijuganorumatifu.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/39307532129.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/giwudopimovuledetaked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c307a11b-a381-4ded-b3f7-25f945a9299e/baratinosubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28d771f-3309-4450-8e01-abfb9fa79510/punisher_kills_the_marvel_universe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8824d7e1-d953-48a2-9d13-4109f8c0853c/calculus_one_and_several_variables_p.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_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 5436 bytes
SHA-256: 482344cdd282118453f06fe19bcdc8d42ef6818a8e714e7af6fcff7014081b25
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 10516 bytes
SHA-256: c068f5922f9e4851212045f7c893fe64667d47e32210d69a947f4273ac789f84

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