Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae6a3f154683ac0…

MALICIOUS

PDF

77.1 KB Created: 2021-04-06 10:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5bccacdc8cb3e642f02e162a87f52ad4 SHA-1: b57e8b342082b47e4aa94d4780d05ca720a47fc8 SHA-256: 8ae6a3f154683ac081d1ad6d2edc48f98a5d2f777778f03db375d7ce3c09f76e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=medical+biochemistry+by+vasudevan+pdf PDF link annotation
    • http://nanamojuvimujo.medianewsonline.com/best_interior_design_schools_in_houston.pdfIn PDF document text
    • http://vnatural.space/nominal_ordinal_interval_ratio9v7gp.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/jhjgicV/doodle_halloween_2017_juego.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/fazatujita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414334/normal_5feb0748addf8.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/fMjdYUE/58410007740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_6003cde069e9c.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/nosinonesutudupapexalog.pdfIn PDF document text
    • http://petersikdar.com/free_lawyer_letterhead_templatesokt0z.pdfIn PDF document text
    • https://mizugoveram.weebly.com/uploads/1/3/3/9/133986338/d982d726f988d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5ff06f0322e50.pdfIn PDF document text
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/e700c.pdfIn PDF document text
    • https://gexokatex.weebly.com/uploads/1/3/5/9/135960098/towodemumanazut.pdfIn PDF document text
    • http://ostanni.fun/zuxukoxafeyecrv.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/pdf_to_word_nitro_crack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_602093374c937.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/eahhgiv/general_tso_chicken_calories_take_out.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://sufixis.myartsonline.com/58348686535.pdfIn PDF document text
    • http://merojupamen.epizy.com/anion_and_cation_worksheet.pdfIn PDF document text
    • http://bibikefogive.epizy.com/dofegilevo.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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 5584 bytes
SHA-256: 347ed872a95bf0756496d1b649a093e231694df8923c65e4907d8e3114bcbe42
font_01_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 10772 bytes
SHA-256: ea26f360cd2378256b8a9d7b7f18e06ca595a5b87de3981a8e893bb0af4dcf4b
font_02_sfnt_off00011918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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