Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87b9c8a8e3c810a…

MALICIOUS

PDF

85.0 KB Created: 2021-03-24 20:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d373a65552aa09b25b54d2be6647dd6 SHA-1: dacd7627f4481d2394501fa82f70e8fc9768377b SHA-256: a87b9c8a8e3c810af0f8bde6e59dd174bd50363e09e5f5c70989ef548e1f4f66
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a "link farm" by heuristics. One of the primary URLs, `https://xezojetit.ru/strik?utm_term=how+to+turn+on+a+jacuzzi+bathtub`, suggests a lure to a potentially malicious website. The presence of numerous PDF links and the ML classifier's high confidence score indicate a malicious intent, likely related to phishing or SEO abuse.

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://xezojetit.ru/strik?utm_term=how+to+turn+on+a+jacuzzi+bathtub
    • https://cdn.sqhk.co/bipozipo/fPxtgd7/vertical_pouch_packing_machine.pdf
    • http://rijebipimaba.getenjoyment.net/hormona_adrenalina_funcion.pdf
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/6c435651.pdf
    • https://soxuwewoduxewu.weebly.com/uploads/1/3/4/0/134042667/2901409.pdf
    • http://pasiworuwiwoz.getenjoyment.net/81750896067.pdf
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/1017911.pdf
    • http://keluzizizeroki.getenjoyment.net/carbon_nanoparticles.pdf
    • https://dulebepil.weebly.com/uploads/1/3/3/9/133999512/xilav.pdf
    • https://sikowegapewabi.weebly.com/uploads/1/3/5/9/135975971/sivogikowi-tonif-pusavelakita.pdf
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/netipafuv.pdf
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/9123959.pdf
    • http://tozofuji.scienceontheweb.net/99163137425.pdf
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/57d66a60.pdf
    • https://cdn.sqhk.co/sewizefaxiki/figggrC/food_web_worksheet_printable.pdf
    • https://kopepadozuko.weebly.com/uploads/1/3/4/5/134505487/2787186.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6ff7dcb7-198a-4b7e-8274-a8c76530bb8c/dating_for_6_weeks_now_what.pdf
    • http://nosigegu.onlinewebshop.net/vobapisapabepagimi.pdf
    • http://ferugasa.epizy.com/53532998629.pdf
    • https://uploads.strikinglycdn.com/files/89cfddaa-a0dc-4573-a5ae-3f399c9ec395/giroxeneku.pdf
    • https://uploads.strikinglycdn.com/files/aef8d67a-4301-47ed-8cfb-e3944253e132/oakley_jawbone_original_vs_replica.pdf
    • http://dakezemafatelo.epizy.com/kesafomikowav.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_off00010eac.bin
1f52d43eb9850531d6f5c576f4e97acd6701819a446c38f69be074b02fdefdfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 4996 bytes
font_01_sfnt_off00011fbf.bin
544ff23f7f0731ab8668c9bec1c1d1d4261518c57845d84cd4418a46a7e2f6e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 11428 bytes

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