Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d13335db98ee5a5…

MALICIOUS

PDF

79.9 KB Created: 2021-03-02 20:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 890fdc429b0a8efbda5a5b8878d64c34 SHA-1: 6b39ef53148a99875941e13513e1e074abb59d27 SHA-256: 9d13335db98ee5a5d6cec4636f1f4f8227d25db7ee1a3dc2327c6a038ff768ce
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to reference transcript-related keywords, likely serving as a lure to direct users to malicious or spam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/wix?keyword=ucf+get+an+unofficial+transcript PDF link annotation
    • https://cdn.sqhk.co/pedidagow/hfgiVGH/26469227905.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/14925817760749z6.pdfIn PDF document text
    • https://getazepamotiga.weebly.com/uploads/1/3/4/3/134352900/veminof.pdfIn PDF document text
    • https://jerimokini.weebly.com/uploads/1/3/4/4/134484757/f38600b1a8.pdfIn PDF document text
    • https://gefatute.weebly.com/uploads/1/3/5/3/135345711/6549453.pdfIn PDF document text
    • http://amst-watch-v2.club/kepipjhlmm.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/HVNvjd3/84419211550.pdfIn PDF document text
    • https://cdn.sqhk.co/fidegelotag/c4rdgZY/9366124184.pdfIn PDF document text
    • http://minuette.me/gezugotuledekadox6yhqh.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/Hcggyge/map_markers_army_nsn.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/gdggd3r/frog_jumping_mark_twain.pdfIn PDF document text
    • http://salonapp.xyz/cars_coloring_pictures_to_print7znyp.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/ji4ghhe/best_indoor_ant_killer_home_depot.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/TIhdhjj/sadetisaravivid.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/giahhhf/misojodamuxurun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawujularow.rf.gd/bairavi_movie_songs_free.pdfIn PDF document text
    • http://luvewon.epizy.com/atomic_structure_diagram_worksheet.pdfIn PDF document text
    • http://teguzudimotu.epizy.com/passport_renewal_form_child_canada.pdfIn PDF document text
    • http://vetoraj.rf.gd/32212382797.pdfIn PDF document text
    • http://jiwenufaxo.epizy.com/abbyy_finereader_sprint_free.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_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5176 bytes
SHA-256: 26a0b4a7bfc61ecebb8e86edd5c39fc8aac040a0da231b7ace2cc6391dea727a
font_01_sfnt_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 15900 bytes
SHA-256: fb8fb54972a3c30993eba11dd357b6e143dd9b25495e62b0e708756a970d6768

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