Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ae16404f716d50…

MALICIOUS

PDF

77.8 KB Created: 2021-04-12 01:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4eb03e06948d9968f5cacfce7d49d3ad SHA-1: 7731167c8388f2bac200596e2ad7955d186d1de3 SHA-256: 55ae16404f716d501615db74bf4fbf9c8953c7c80b65bd9dd04ae4271718735d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and one specific URL, https://vilenefex.ru/strik?utm_term=jack+reacher+tv+series+season+1, is directly associated with the lure content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=jack+reacher+tv+series+season+1 PDF link annotation
    • http://vuzikazoga.22web.org/negative_reinforcement_in_the_classroom.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/puvotogovivegijulotu.pdfIn PDF document text
    • https://gijejutet.weebly.com/uploads/1/3/5/9/135974865/ed73a23c699bd0b.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/gajuxiguf.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/ielts_reading_passages_download.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/56471345876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/safety_first_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/mission_statement_template_for_students.pdfIn PDF document text
    • http://vovajixavago.epizy.com/kidamezajasubebadaw.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/51529139904.pdfIn PDF document text
    • http://ruvotavigep.rf.gd/comparing_dissimilar_fractions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/bsf_lesson_25_day_3.pdfIn PDF document text
    • http://dafitigare.epizy.com/wugokavofoxepedod.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/bogunanu.pdfIn PDF document text
    • http://vixoxuzet.epizy.com/please_understand_me_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/what_is_hegel.pdfIn PDF document text
    • http://foxoxamaxanibi.epizy.com/asme_b31._1.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/happy_birthday_funny_status.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/ariens_824_owners_manual.pdfIn PDF document text
    • http://fozikabev.epizy.com/67973283580.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/adjectives_word_search_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/2005_cadillac_cts_transmission_control_module_location.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/coleman_powermate_6250_generator.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 5020 bytes
SHA-256: 3f4f31fb5367a5e1183fa0beea21d1b8594a1eb7c17abfc73dcca3e3a3959bd4
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 10912 bytes
SHA-256: 6fd31ae68c8bd3bbb17b1eb186e921f2613524ea9375cc4d70aa1deb8cb762ed

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