Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70f59437516a8b1…

MALICIOUS

PDF

77.7 KB Created: 2021-04-09 10:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0258757f15a6fb63e1781631a7c863c6 SHA-1: 32bd84b7aae9320f6875fa379e0f3059a37fd6e5 SHA-256: a70f59437516a8b17067d000ee393660f8d05ff2ae541c279f33c689c8945863
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a large number of external links, suggesting it is part of a link farm designed to distribute malware or phish for credentials. The embedded content, though obfuscated, likely serves as a lure to encourage users to click on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=how+to+take+care+of+calla+lily+flowers
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/werumogozabilo.pdf
    • http://rozefuzapotor.iblogger.org/mobile_ringtone_free_apple.pdf
    • http://namixojebeku.iblogger.org/92386747226.pdf
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/niduvabexibuji-jufesogizatim.pdf
    • https://cdn.sqhk.co/rureroso/BifxVO9/alarm_clock_for_heavy_sleepers_walmart.pdf
    • https://tefajarusi.weebly.com/uploads/1/3/0/7/130775660/pibavabuvisop.pdf
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/vopun_livigudefarenu_fabumubu.pdf
    • https://cdn.sqhk.co/joremeve/hgehijf/les_secrets_du_coran_pour_etre_intelligent.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/nibodobozabe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bogijexu/cisco_ws-_c2960x-_24ts-_ll_datasheet.pdf
    • http://jelazub.rf.gd/55295919518.pdf
    • https://s3.amazonaws.com/libowebujakux/good_moral_character_letter_for_immigration_template.pdf
    • http://goruwon.epizy.com/dolubefu.pdf
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_c55ce18fe3dd4e5f9a97d3372c21ea5c.pdf?index=true
    • https://s3.amazonaws.com/tojabixefova/1749232621.pdf
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_b860d95fc44f4b48bfff145626495ca4.pdf?index=true
    • https://s3.amazonaws.com/tikofaketonub/activator_windows_7_ultimate_by_daz.pdf
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_a93024a3995f41c196f10548d7a0fdd7.pdf?index=true
    • https://s3.amazonaws.com/retisovojor/entrepreneurship_education_in_zambia.pdf
    • https://s3.amazonaws.com/vapite/atlantic_beach_north_carolina_surf_report.pdf
    • https://s3.amazonaws.com/bagokiko/email_phrases_formal_and_informal.pdf
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_3a83633edcce45d090430f7636eee0d2.pdf?index=true
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_d1200ccef84b424b8ab233752fbec694.pdf?index=true
    • 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_off0000f4a0.bin
6fdad900012c09463c8e0df0c1d6c34c91f500a84a1948a7286a9031d55dd8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 5092 bytes
font_01_sfnt_off0001061d.bin
8bdb8c560ffe3be8a39b781e1094781895f486e3b3233a6974468b0d6b31d005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 10248 bytes

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