Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bd91120387949a…

MALICIOUS

PDF

79.3 KB Created: 2021-04-17 08:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c23146a6773b278f563c9dcd6d08e675 SHA-1: 507469b6d532c9c832afca32eb43dbfb38ed7152 SHA-256: 43bd91120387949a0e0603037ae990852e840def6993f75b2363f28a722711d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to textbook content, likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=ap+human+geography+textbook+the+cultural+landscape+13th+edition
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5ff005a154594.pdf
    • https://wogifirum.weebly.com/uploads/1/3/1/0/131070377/devides.pdf
    • http://metryck.info/wawajuvulogoigjd4.pdf
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/7460096.pdf
    • https://cdn.sqhk.co/jorawuge/jjYgjyw/8682732450.pdf
    • https://mexasazage.weebly.com/uploads/1/3/4/5/134513067/logurawufik.pdf
    • https://cdn.sqhk.co/fitamorigob/ulhar5R/dedomexapasoxuvurituvow.pdf
    • https://cdn.sqhk.co/nemisova/du0gjic/nalejidogawilonepimumep.pdf
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/nuwegugez.pdf
    • https://cdn-cms.f-static.net/uploads/4425484/normal_606de757aa9a9.pdf
    • https://static.s123-cdn-static.com/uploads/4464070/normal_5ffe0e07ee0d4.pdf
    • http://uniques.space/462804182012o2d8.pdf
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/2fa15e9.pdf
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/f27ea.pdf
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/6715414.pdf
    • https://cdn-cms.f-static.net/uploads/4403807/normal_600f24612e753.pdf
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/7124105.pdf
    • https://cdn.sqhk.co/luvutagawata/ibheAhK/gif_to_video_app_instagram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8c9a6444-61fe-46cd-93dd-498a64b47c74/fiponuwofe.pdf
    • https://uploads.strikinglycdn.com/files/ae6f8841-cbed-4d18-b190-b8e769fddb33/banekemuvedifug.pdf
    • https://uploads.strikinglycdn.com/files/de8f1a92-6982-4224-afe9-597325fd66c8/plantronics_voyager_pro_legend_pairing.pdf
    • https://uploads.strikinglycdn.com/files/c24d8099-f011-4119-9bf3-cb319bdea3af/best_solvent_for_recrystallization_of_acetanilide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31b.bin
698f423dcd9d4a34f0d76acc0379dd59e01ec0a1a9b6be75ac97248439dac240		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 6068 bytes
font_01_sfnt_off000107a4.bin
80433cd351054fbc816a4a869bd18b6af6e0a5a92b8c853059597cdbcbbc1cd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 10988 bytes

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