Malicious PDF — malware analysis report

Static analysis result for SHA-256 d436d728d576a00c…

MALICIOUS

PDF

77.9 KB Created: 2021-03-04 00:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0152b798e2022339751a3f98a317b2ff SHA-1: f90a5b12e7a7ffffdcb6302220c2f6ec03f32c5a SHA-256: d436d728d576a00c263a6b4b8460ab828979662178d4e5edf706330b3a6f1e0e
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users seeking information, redirecting them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/123?utm_term=how+to+write+apa+style+reference+for+website PDF link annotation
    • https://cdn.sqhk.co/jumifokujuje/jiahjAx/miganojubololuguz.pdfIn PDF document text
    • http://antonioita.fun/ezreal_guide_2019787bh.pdfIn PDF document text
    • http://creampiepow.club/how_did_the_estate_system_work_in_francearohb.pdfIn PDF document text
    • http://formblckr1.xyz/tovafitabfxxti.pdfIn PDF document text
    • http://fruit-ita.fun/93146166313f9x1x.pdfIn PDF document text
    • http://mnogoturov.com/article_371d_in_telugudagge.pdfIn PDF document text
    • https://sidatenut.weebly.com/uploads/1/3/5/3/135349940/donufakovogal_fozatu_pamawixubasini_watadogude.pdfIn PDF document text
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/d4e8e.pdfIn PDF document text
    • http://theboldpantsproject.com/wemagimovabulekevebiwd000.pdfIn PDF document text
    • http://keksik24.ru/what_is_a_good_bible_verse_for_healing5hr7x.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/jigharu/equalizer_hitch_for_sale_calgary.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/jirumosevoban.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/ae69b4779177.pdfIn PDF document text
    • http://qunit.space/lavafogiqznkf.pdfIn PDF document text
    • http://ketotreno.buzz/abnormal_psychology_13th_edition_downloadts7en.pdfIn PDF document text
    • http://telgrm.site/mapunilokugobakuwagebonapl0cs.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
    • http://foduwisidowej.rf.gd/90458144908.pdfIn PDF document text
    • http://matujuluji.epizy.com/40010213189.pdfIn PDF document text
    • http://kuzojif.rf.gd/belgium_pro_league_form_table.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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 5092 bytes
SHA-256: ac31c0a432771f662580b698cfb8c50d6c8c1fb083989c158f2d6271e85ed07b
font_01_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 10184 bytes
SHA-256: ac2857b24e8d73adaa63f4c199b4356a3d826c97d84a42c0163da9e773ee74cd
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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