Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a839b4c92a94e0b…

MALICIOUS

PDF

101.1 KB Created: 2021-03-15 01:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a7e5031e928920f65bf746c70020d6f8 SHA-1: 78869f02d86de4a2e98733d44ff4541ec4eaad8b SHA-256: 8a839b4c92a94e0b4ab92513bff7663ffe9867e2b38b97306dd153f5c22ef7de
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 0.9987

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://resalured.ru/strik?utm_term=my+forbidden+face+chapter+5+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459935/normal_60161429ac99b.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/zesifapumulajorujuwuwidav.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/ifgglXl/gojimimozawotonadateso.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/small_splitsen.pdfIn PDF document text
    • http://wewofif.scienceontheweb.net/behaviorist_and_mentalist_theory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_6041a9ef5d9cf.pdfIn PDF document text
    • https://cdn.sqhk.co/bivosemubo/Xhzidij/kivijewudatunixazox.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/waselanereganodafar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_6022dfc0ebe04.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/nokapowagajuf.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/iak31np/tugotikifefel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5fca6a0de1bee.pdfIn PDF document text
    • http://finonit.mypressonline.com/fiwid.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/hidhbYQ/paypal_credit_security_phone_number.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/67160236739.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/hchhH5I/viponumofa.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/YhihcEI/pakuwok.pdfIn PDF document text
    • https://cdn.sqhk.co/jivobukafon/gcLMjfo/beginner_drum_beats_sheet_music.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
    • https://uploads.strikinglycdn.com/files/1a90f794-6955-4d95-9597-59184ad1e01c/napegegixorosokilebajatad.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/the_amazing_spider_man_comics_fr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744c80e8-32dc-4edb-8080-67b03b5507b1/bolens_mtd_lawn_tractor_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5e96ec-b1f5-451a-aa05-99d95e06271d/zero_and_negative_exponents_worksheet_kuta.pdfIn PDF document text
    • http://sinusisokopex.atwebpages.com/un_curso_de_milagros_leccion_34.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b89a7b-539b-4a39-928e-91580f51871b/6916520276.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_off00013f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F58 5616 bytes
SHA-256: 2c3515582536a591707bbf5663f80a03c6151759777dbbfa20e8e087de56928a
font_01_sfnt_off00015253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15253 10824 bytes
SHA-256: 84225eb5531b61850b8a0fcbd42af24d50c05e6676fc304377980849dd856288
font_02_sfnt_off000176e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176E7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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