Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e6db87a43d18d3…

MALICIOUS

PDF

116.9 KB Created: 2021-03-28 20:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 626f75ea0e5245768e1a91fa67d35cc1 SHA-1: b7835ef238c199e8da37fd7080dcb5f9c520ba7a SHA-256: f5e6db87a43d18d3c3da4b3c23119df0b7b195e735832a8384179a6e34a0a7de
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's part of a link farm and contains external URIs. The document body, though heavily obfuscated, suggests a lure related to a book title, likely to drive traffic to malicious sites. The presence of numerous external links, including one to 'midufefew.ru', strongly suggests a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=fundamentos+de+administracion+de+empresas+3+edicion+pdf+gratis
    • https://cdn-cms.f-static.net/uploads/4476939/normal_60608c1731de2.pdf
    • https://static.s123-cdn-static.com/uploads/4410448/normal_5fe4d8e3ed970.pdf
    • https://cdn-cms.f-static.net/uploads/4382617/normal_605b94827e38e.pdf
    • http://vowufijetapiko.sportsontheweb.net/how_to_sign_up_for_salvation_army_christmas_assistance.pdf
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5ffd995dd6d32.pdf
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/gapaxet.pdf
    • http://zugoruvupigit.iblogger.org/13287559351.pdf
    • https://cdn-cms.f-static.net/uploads/4530151/normal_60107398896bb.pdf
    • http://nevozepamuj.iblogger.org/sword_art_online_light_novel_english_download.pdf
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/0a4cb4eb.pdf
    • https://vipigenomunopem.weebly.com/uploads/1/3/1/3/131398348/tomag.pdf
    • http://ruxuzosok.mywebcommunity.org/wasowelixaboj.pdf
    • https://static.s123-cdn-static.com/uploads/4504568/normal_6001d6678b0f9.pdf
    • http://mowukedova.mypressonline.com/63926636882.pdf
    • https://fadefufogu.weebly.com/uploads/1/3/5/9/135960472/8142961.pdf
    • https://static.s123-cdn-static.com/uploads/4370074/normal_5fc864da45ca7.pdf
    • https://cdn-cms.f-static.net/uploads/4412588/normal_603ded0a808e1.pdf
    • http://porizaritofo.mypressonline.com/wilejudosaririwebosojoxa.pdf
    • http://taxezobojoxa.iblogger.org/dd_wrt_router_setup_repeater_mode.pdf
    • https://cdn-cms.f-static.net/uploads/4487416/normal_6040dab694f05.pdf
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/popan-xegola-dekodovemoposaf.pdf
    • http://saxosoxajivovud.medianewsonline.com/anandamela_pujabarshiki_1424_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4468289/normal_60223a319cfef.pdf
    • http://suxinojopamur.iblogger.org/40532722002.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.fontrix.comhttp://www.nhncorp.com
    • http://wagibederujejo.rf.gd/nuzuraburukupin.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017301.bin
c889f7d8bf95317dd501c77c1059aa38a1b232f54a35ff908b1e21ccd8173373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17301 5564 bytes
font_01_sfnt_off000185d8.bin
9c3e05b4f020b6c56f3b928d31ec94393b49007e1e08129c3e479094f55e04ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x185D8 2168 bytes
font_02_sfnt_off00018f37.bin
1baad290e5352ea28b697e8a22aae62e6296fbccc794ca5302ee1e06998df9c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18F37 12988 bytes
font_03_sfnt_off0001b8dc.bin
6fe7e98a9cc89e380927aa8edda20a7a363b960d5cd406d655d4abc13a1eac72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8DC 2088 bytes

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