Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8cac792bd386f2…

MALICIOUS

PDF

86.0 KB Created: 2021-03-25 15:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c993ec27a157cd95f891153d1281cad9 SHA-1: 218f233dc1e047cd2ab8ecf29a50a550fae4751f SHA-256: 0c8cac792bd386f28fb5e9a72968cf07c99a019025e52c1c19712e6a17752040
196 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 are disguised as legitimate documents, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a precursor to delivering a password-protected payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://soxebez.ru/award?keyword=general+banking+terms+pdf
    • http://kijuguwosaxo.22web.org/student_information_system_ppt_free_download.pdf
    • https://gifolavetufo.weebly.com/uploads/1/3/2/6/132695571/tejozumad-dixanopazavizo-tuxedikeveguw.pdf
    • https://viluvaxev.weebly.com/uploads/1/3/5/9/135974466/zilewasimexag.pdf
    • https://static.s123-cdn-static.com/uploads/4383340/normal_5fec213bf00c2.pdf
    • https://zupalopozaguri.weebly.com/uploads/1/3/2/3/132302876/soribumupowola-vegubufewolof.pdf
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5fdd33905ee37.pdf
    • https://static.s123-cdn-static.com/uploads/4501975/normal_5fe00afab45a2.pdf
    • http://bevamifugidujew.scienceontheweb.net/isolation_and_identification_of_pathogenic_bacteria.pdf
    • http://wijutomotagam.mypressonline.com/pelekexarofarotev.pdf
    • https://melonugijiroduk.weebly.com/uploads/1/3/5/3/135325977/felobeseromati.pdf
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/3594507.pdf
    • https://xomepuwosabagef.weebly.com/uploads/1/3/0/9/130969083/felulefawaw.pdf
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/sikitus.pdf
    • https://static.s123-cdn-static.com/uploads/4412408/normal_5fe268e951436.pdf
    • https://cdn-cms.f-static.net/uploads/4402244/normal_60170ff7ae933.pdf
    • http://gisoboxizaza.mygamesonline.org/what_is_the_best_gout_diet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://petikagemejol.rf.gd/cheran_express_chennai_to_coimbatore_platform_number.pdf
    • http://kisalonokexiwi.atwebpages.com/ubee_modem_dvw32cb_wifi_password.pdf
    • https://s3.amazonaws.com/domegagowevag/kaspersky_antivirus_trial_version_for_pc.pdf
    • http://xilibosukotijob.epizy.com/55889188548.pdf
    • https://s3.amazonaws.com/wupixufekijax/convert_base64_string_to_angularjs.pdf
    • http://bekokutiwafodi.epizy.com/51940245361.pdf
    • http://bepavut.rf.gd/tunewarep.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_off00011182.bin
c706e15551898bb3dd87afee610de06e08c2f35042e718cdd0f9bf3a7371c511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 5596 bytes
font_01_sfnt_off00012471.bin
7027f0a6d56173f1a4638829c555ee5b8e4877bdf76783c09e88c532f91eeac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 10808 bytes

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