Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3c2620b0a8a2cb…

MALICIOUS

PDF

77.1 KB Created: 2021-03-29 00:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d707eb4ce3dca6991de7f2015a49f5b2 SHA-1: 96279d0b012e7c59aab453af8be13cbf77838dd4 SHA-256: 3a3c2620b0a8a2cb83467362d33b1d735978bcb3f3a6d5893941c154a15c20ad
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 of which point to other PDF files, suggesting a link farm or a distribution mechanism for further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://jacksth.ru/strik?utm_term=what+is+a+certificate+of+divorce
    • http://gizovivomiz.getenjoyment.net/potipaj.pdf
    • https://newakikijako.weebly.com/uploads/1/3/4/3/134351088/1381069.pdf
    • http://xepidenad.scienceontheweb.net/cirque_du_freak_series_review.pdf
    • https://cdn.sqhk.co/riwaxagi/hiqAthg/let_s_create_art_lakewood_ranch_fl.pdf
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/pulaxoxaxob.pdf
    • http://konolux.medianewsonline.com/online_to_autocad_converter_free_download_with_crack.pdf
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/gedovazixubidu.pdf
    • https://cdn.sqhk.co/favosejo/0Phchhd/62331374573.pdf
    • http://vazagitomis.mypressonline.com/94464695926.pdf
    • https://cdn.sqhk.co/vomisape/hcSIhfl/96000032738.pdf
    • https://cdn.sqhk.co/kosaboze/Wjijhhj/hit_the_middle_button_meme.pdf
    • https://peturenu.weebly.com/uploads/1/3/4/4/134401199/xiluta.pdf
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/remirajebezamezazi.pdf
    • http://sitizinudex.getenjoyment.net/97815464130.pdf
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/ab451c038f678.pdf
    • https://xonajuximo.weebly.com/uploads/1/3/5/3/135311854/8e5f6.pdf
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/5662700.pdf
    • https://cdn.sqhk.co/videgogaf/H5xjey7/51366806524.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rewuwuja.onlinewebshop.net/mufikorewo.pdf
    • http://mawidinivetobi.myartsonline.com/watermark_software.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_off0000ef95.bin
f40d7eaed07a954f154a682831ef5efdb453ff3951e747b4ef534dec004cfef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 5152 bytes
font_01_sfnt_off00010127.bin
bdb5f7c7dd75429df13f8e69774f6f70857d8e6d6e5b19359f2ec1c20bdf6e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 11236 bytes

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