Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b234e346ec6d9dc…

MALICIOUS

PDF

70.1 KB Created: 2021-02-20 17:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7ec0ca809c26d1112cdcb8716447fd5f SHA-1: d13488c8ffb9686c19599a0b7994432acabbfbee SHA-256: 7b234e346ec6d9dc5a7e4567641fa74ad1bc7c60dd9dbc8bb7c303a7706ca3c0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are disposable or hosted on suspicious domains, suggesting a link farm designed to manipulate search engine results. One of the primary URLs, 'https://jottigo.ru/strik?utm_term=keurig+b40+filter+replacement', appears to be a redirector for phishing or malicious content, disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://jottigo.ru/strik?utm_term=keurig+b40+filter+replacement PDF link annotation
    • https://wuluruvujomokax.weebly.com/uploads/1/3/5/3/135349857/5601586.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/7FnbRUJ/lesson_plan_template_editable.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/student_loan_forgiveness_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_6016c1204ee6e.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/iijeIie/tie_dye_patterns_diy_bleach.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/EggigI4/masonic_temple_escape_room.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/WigghZW/44775853444.pdfIn PDF document text
    • http://wezaxofakobitig.22web.org/50654832521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/coppelia_mazurka_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/sheet_music_brahms_lullaby.pdfIn PDF document text
    • http://fizufanotujo.epizy.com/short_formal_dress_patterns_with_lace.pdfIn PDF document text
    • http://zaramapowo.rf.gd/xejutoropoludipetatewoted.pdfIn PDF document text
    • http://kixomeremit.epizy.com/xuzijexejuxizudes.pdfIn PDF document text
    • http://monulaw.epizy.com/botawapaninebu.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_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 5496 bytes
SHA-256: b8ad12e63a9c79d32980d46ba95e25ee5f1488023cf906f5f664da57b744182d
font_01_sfnt_off0000e770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 10696 bytes
SHA-256: f21e649f1795e8f2faa04c14c9df59bc812d56b3c7a5a092767a7a8981c9e648

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