Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f656f5afb11d1ea…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 11:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f3a666181409bb6671a36945e03b2b47 SHA-1: e1a4caf922e4bcc027ced29e941e396991970fc2 SHA-256: 3f656f5afb11d1eadd9080b5313852a15171978238674159356a4d6331670946
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 0.9996

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://crophysi.ru/award?keyword=balanceamento+por+oxirredu%25C3%25A7%25C3%25A3o+exercicios+resolvidos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461484/normal_60388990bdab6.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/zajadipok.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/jaiipfO/ftdi_usb_to_serial_arduino.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/gdjgJjg/download_game_studio_tycoon_2_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480591/normal_603e3ecc20fd7.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/1hfhhjf/hide_and_seek_guide_mabinogi.pdfIn PDF document text
    • http://xenejesujotolud.mypressonline.com/libro_cero_defectos_crosby.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/mavijaxupeserel.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/4idOY3m/sipipo.pdfIn PDF document text
    • http://fimewovoko.getenjoyment.net/psychology_objective_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/hjhdihw/82375366226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_6006daeb348c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_603431ea9c461.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/hhujbha/zukitosi.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/42615691283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_5fd68521a55b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_604cebeecaa29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492275/normal_5fed13912c029.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/Snwijjd/21316337883.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixidil.atwebpages.com/tebowefotumolejikunosima.pdfIn PDF document text
    • http://sijadogif.atwebpages.com/30951761701.pdfIn PDF document text
    • http://mojozore.myartsonline.com/vicks_starry_night_humidifier_green.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 5976 bytes
SHA-256: 7d3e0b79513a06a3572e059d6803b63fefa766135da87c683e5d7e757dc1225f
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 12944 bytes
SHA-256: 079238ad384f8447a4f0eece2fac89ece3e77791f71db18c8871bc99223a8568

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