Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9e7c9c0d1de31f…

MALICIOUS

PDF

72.9 KB Created: 2021-03-10 03:18:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 02496c34a7e126aebb0edd1f174841da SHA-1: db804e168eabaed664a30b4ee9dd07759147758c SHA-256: cc9e7c9c0d1de31fbe81f5a3fa85d82346894e22e14e49542289f1ecc6d20a0a
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with a high ML classifier score and ClamAV detection indicating malicious intent. It contains numerous external links, including a suspicious URL on 'midufefew.ru', suggesting it is designed to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=tru+prep+academy+vs+img PDF link annotation
    • http://myshoes.moscow/99330222373me1cz.pdfIn PDF document text
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/20e295.pdfIn PDF document text
    • https://nigenodesi.weebly.com/uploads/1/3/4/4/134480521/3873875.pdfIn PDF document text
    • https://sutenemumam.weebly.com/uploads/1/3/5/3/135323571/piganejuzoweb-xemagizu.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/jujenovj5gm1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469145/normal_5fe0082f8d203.pdfIn PDF document text
    • http://atomyimperial.ru/46735366715u1tyw.pdfIn PDF document text
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/2984266.pdfIn PDF document text
    • http://wokizunapajunez.iblogger.org/2014_cadillac_srx_owners_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fe0742b56d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_5fe6dacfbdac8.pdfIn PDF document text
    • https://vukexelisijaka.weebly.com/uploads/1/3/1/0/131070195/sebudu.pdfIn PDF document text
    • http://rimka.xyz/rosoporol9kbx2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_ae5e38f15082441497c203dc6df87846.pdf?index=trueIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_30027b8490634a429ded2f72ba13fe0a.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_c9b85e82d23f49a198e3b17094d7a319.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_ab9c6c5ec8d8479d953d76278e357159.pdf?index=trueIn PDF document text
    • http://puxirozenudut.rf.gd/21918256544.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_112a39925b5c4811a94be8c6fdabd80f.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_c0394c97278443b583b94d2a24269032.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_732ee642af3f4c6eb762d8e1275d12bc.pdf?index=trueIn PDF document text
    • http://xarififipevi.epizy.com/tikudobenase.pdfIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_8c4d4577e8f642e393eed08997719d26.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 5060 bytes
SHA-256: bc9cae45ec1bf32b5cbc439b0fc67890511b49340f835cba7b0099f4ca537225
font_01_sfnt_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 10692 bytes
SHA-256: d4f83e5a918a958225ea0465a090afdff11825f1f931159d21c00ad64b3273d1
font_02_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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