Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85f9f42637d95a6…

MALICIOUS

PDF

75.4 KB Created: 2021-03-03 21:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: abe269c3318ec46e58ff3b77b9018e8f SHA-1: 163c3672bf9d6e85d2cba160356c15472d577a30 SHA-256: b85f9f42637d95a6880877509a0fec3d2b0a6ba463d7cbcc39a5d5161a3b0163
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of an embedded URL and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://midufefew.ru/wix?keyword=chris+corner+bayonne+nj PDF link annotation
    • https://cdn.sqhk.co/velabolo/ibihdgj/luselinozixawe.pdfIn PDF document text
    • https://zifimebitumane.weebly.com/uploads/1/3/4/2/134236425/diguvudebokopuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/f0cjewS/cafe_racer_parts_bmw_k100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_6035fce7d38c1.pdfIn PDF document text
    • https://cdn.sqhk.co/remokuvupen/ig4VxO6/onedrive_download_button_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_6029ee50676f2.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/0b516c3.pdfIn PDF document text
    • http://xepomujix.22web.org/89948221478.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/hhcyFO1/motorcycle_wallpaper_hd_apple.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5fd9d69244fde.pdfIn PDF document text
    • https://cdn.sqhk.co/fupipevu/g7gdhh5/temple_run_game_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5fcea8732ee78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilemizofi.epizy.com/cierre_de_barrera_hematoencefalica.pdfIn PDF document text
    • http://mirijevedot.epizy.com/fotubuxekavoted.pdfIn PDF document text
    • http://maxusopexezevob.epizy.com/days_with_frog_and_toad_the_hat_comprehension_questions.pdfIn PDF document text
    • http://riporem.epizy.com/kudobinuv.pdfIn PDF document text
    • http://visititeralu.epizy.com/transformational_leadership_theory_examples.pdfIn PDF document text
    • http://sijurajogo.epizy.com/18204386271.pdfIn PDF document text
    • http://daraxelasapok.rf.gd/what_qualifications_do_you_need_to_be_a_lash_technician.pdfIn PDF document text
    • http://sulijik.rf.gd/journal_voucher_excel_format_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_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 5076 bytes
SHA-256: 357d769947bae765361890e4c2c6e793d62a156beaf2cf3766f3567ecf5e143c
font_01_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 10252 bytes
SHA-256: ff6e5c0259604b5001b9c8fd602b04b96f766418f0c3dcb5c6775fd305db4d41

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