Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3373605441f2f5d…

MALICIOUS

PDF

73.6 KB Created: 2021-04-29 19:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 04f6bac363fbd9d49e738307aa7204c4 SHA-1: afc854bb6ec7c9ef2ce50b290ec2b36fabe5e46d SHA-256: c3373605441f2f5d6645e3f391e7028fea0244665919b6f7a736d3d0870f3c3a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=american+journey+history+textbook+8th+grade PDF link annotation
    • https://cdn.sqhk.co/vadavenaw/jgjmhjP/tetapos.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/gjLZYph/dipimogunamovexumokex.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/5624544.pdfIn PDF document text
    • https://bulejoge.weebly.com/uploads/1/3/0/7/130775594/32a4504bb2e.pdfIn PDF document text
    • https://xavodujur.weebly.com/uploads/1/3/5/9/135972692/999008.pdfIn PDF document text
    • https://famofupogatom.weebly.com/uploads/1/3/0/7/130739443/vivite_pedebubogux.pdfIn PDF document text
    • https://mizovitima.weebly.com/uploads/1/3/4/2/134266674/9e9ac37b2.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/gosuvezomowixedopuj.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/butemus.pdfIn PDF document text
    • https://jonaduxito.weebly.com/uploads/1/3/1/3/131384171/0ccba56df980579.pdfIn PDF document text
    • https://tatuwimo.weebly.com/uploads/1/3/4/8/134882860/121870.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/afDdgh0/ice_cream_blackpink_dance.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/piaghja/40650739207.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/defizamek-rejemisazapukom-bajobib-wotedu.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/davodunozisif_suniramijipilan_bajedovatowifun_vuratemugusiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/nefikelifu/djehiig/kiwifikilunozebulonufiku.pdfIn PDF document text
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/niroz_pobotevifolaket.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://s3.amazonaws.com/gavexilatuvitaz/firefox_esr_52._9_windows.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/starship_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/how_to_host_a_clue_party.pdfIn PDF document text
    • http://bidajalej.onlinewebshop.net/algorithm_and_programming_problems_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/html_css_javascript_coursera_quiz_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 5836 bytes
SHA-256: ecf00af02d98dac87fc8e0705f46adba30cd4170c4f69f241796c271af8fb90d
font_01_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 10408 bytes
SHA-256: c64b159bf671034c887edfbac435b478d147a0c653a82942d0ee9a5ddf00f52e
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333