Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4737a9223c815b4…

MALICIOUS

PDF

83.2 KB Created: 2021-03-23 03:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40a724fc3538194c9eb436a2f7ad99d SHA-1: 11abefc887ecf9ec9e2a8829b321e67021df63f0 SHA-256: a4737a9223c815b40329b54f969a76958b25d6711c74d8b3a969e730df88c729
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to PDF files, indicating a link farm or content distribution strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://lozipotod.ru/wix?keyword=mike%2527s+huli+huli+chicken
    • https://cdn.sqhk.co/pojukitogex/g1jhaji/data_analysis_in_statistics.pdf
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/1f7abae.pdf
    • http://midikakuvekume.mywebcommunity.org/68470611510.pdf
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/rodexojebigiwidamew.pdf
    • https://melonugijiroduk.weebly.com/uploads/1/3/5/3/135325977/mupomalewoganosidop.pdf
    • https://cdn.sqhk.co/morureju/KghijuT/rangers_of_oblivion_best_weapon_2020.pdf
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/xunuvaxuze-jugapukoni-lojokanituw.pdf
    • https://xepevuke.weebly.com/uploads/1/3/0/7/130775471/dezumufejazosox_todumisu_tivosukajoxora_tebivel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_2283b1db107d4dde95926f4320b0aab2.pdf?index=true
    • http://vawerudarasikow.myartsonline.com/28616800845.pdf
    • https://s3.amazonaws.com/wenobagupexekap/cheat_sheet_statistics.pdf
    • https://s3.amazonaws.com/vuterijoze/17208845279.pdf
    • http://konewumabujak.rf.gd/asure_id_transfer_templates.pdf
    • http://ninalosuza.rf.gd/zebiwo.pdf
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_d9ea927669da4d9787e49b64d047ed33.pdf?index=true
    • http://tikatogivuso.rf.gd/86034408987.pdf
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_9da5f9477efa4fc6b6ab34e22e87e3f7.pdf?index=true
    • http://vivazuriperulus.epizy.com/how_to_add_days_to_a_date_in_excel_excluding_sundays.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_off00010621.bin
8728abff06d38bdd9de7764ca546de65a3977a1aaa0d31e9e35d90ab360b60fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 4684 bytes
font_01_sfnt_off00011627.bin
3ed0dab6f73a95482c7875662e7691c586776419320bea89715daef538218c62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 11680 bytes

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