Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e536e2b6f43799d…

MALICIOUS

PDF

76.5 KB Created: 2020-11-21 10:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec45e7a35a3d161e10d92565513c9f6e SHA-1: 534921e8a4c8b5fedd2e96fd4ce4a3f6b5a6a7f9 SHA-256: 4e536e2b6f43799de5c1fe7749a55395fd332f8ba8d2d94045fb6f21e8ca333a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external URLs points towards a malicious redirection or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=nhsn+patient+safety+manual+2018
    • https://letitelow.weebly.com/uploads/1/3/4/5/134500939/6bc8cd.pdf
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/doxovuvibajiwinep.pdf
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/8822636.pdf
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/617039e3c15e3.pdf
    • https://lejoxenususoja.weebly.com/uploads/1/3/4/4/134497781/wedutusaxujis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/91cf4aa2-0bd6-4ae3-a91c-9eac9b6a1931/259813124.pdf
    • https://s3.amazonaws.com/mizeteb/42503864029.pdf
    • https://uploads.strikinglycdn.com/files/48703cde-6416-49cf-a017-8f36d817a0f4/bipimidawujunatozinolekek.pdf
    • https://s3.amazonaws.com/rerinago/siliw.pdf
    • https://uploads.strikinglycdn.com/files/27b9a3c1-27d0-48d1-8e9e-da12a3e770ef/24212882376.pdf
    • https://uploads.strikinglycdn.com/files/880657d1-2a5f-4162-b7b5-0e9f82189963/47513970327.pdf
    • https://uploads.strikinglycdn.com/files/fbb8f235-37b4-4150-846c-4d0241726502/seed_of_chucky_full_movie_download_in_hindi_480p.pdf
    • https://uploads.strikinglycdn.com/files/815bbaa1-0263-4133-a4b6-abd5d6d91bf0/ruxur.pdf
    • https://uploads.strikinglycdn.com/files/703e2108-5cf0-423e-a30a-0b7aca0e1d6a/birosob.pdf
    • https://uploads.strikinglycdn.com/files/a728e598-199c-4c9a-8378-d2536219e08b/54636304105.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3d.bin
a8a3962c7840f4a9e05e274b0ee27ba79052f0217c2cacb3ed735a416bc282fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 5408 bytes
font_01_sfnt_off0000f178.bin
654b546b346d0814d4a9d244530446a0301428adc60a57dd9a45206e7911c6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 10992 bytes
font_02_sfnt_off000116dc.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 4324 bytes

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