Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b33f75e9e2255f8…

MALICIOUS

PDF

183.8 KB Created: 2021-04-01 01:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 36df71d0f87d88762fa3abd621b583b4 SHA-1: efe0ac884598f609cc3dc5e8c1419230b3ae3f0f SHA-256: 3b33f75e9e2255f83d2f6a168e72dda3b7fe0eabf4dff263b17734354acb836c
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 0.9993

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://baarspo.ru/award?keyword=chrome+plugins+pdf+viewer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488817/normal_602fdc80f0673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_6033fd1fbbfce.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/4haNUjh/gedupivolinufujarukagages.pdfIn PDF document text
    • http://fezatubiwe.getenjoyment.net/pearson_calculus_textbook.pdfIn PDF document text
    • https://karinavoru.weebly.com/uploads/1/3/4/0/134017817/dosiwopebagidunupa.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/ibYgfkp/gunship_battle_helicopter_3d_hacked_version_download.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/passover_haggadah_hebrew_english.pdfIn PDF document text
    • https://tofaxewa.weebly.com/uploads/1/3/4/6/134672655/mabip.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/zgisijl/word_of_the_day_with_meaning.pdfIn PDF document text
    • http://wuvudazesog.22web.org/nevejutobefegavol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_88c6f73b595b4994b79f51860dc247e2.pdf?index=trueIn PDF document text
    • http://semowomeso.onlinewebshop.net/cancer_gastrico_2020.pdfIn PDF document text
    • http://pirokogux.epizy.com/sovoli.pdfIn PDF document text
    • http://jujabezemaluwe.rf.gd/41492924521.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_fdc0aa0c71424aed9986de6d8c59bfc1.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 142920 bytes
SHA-256: a649d5bc57bbe619ea952cecdb89b00d7602a28f7b73d979a561d35ccedb0e7e
font_01_sfnt_off0002845d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2845D 5304 bytes
SHA-256: a12468b1450208d57acae5f55baf80df9b3ec94c960c5088df9b01d08dc45450
font_02_sfnt_off00029654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29654 10388 bytes
SHA-256: 95768f516ae7f5c5164e9fd83caadeb1181d61bb69fdb0b965034832a406ce32
font_03_sfnt_off0002b9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B9FC 16256 bytes
SHA-256: 45e4072d62b87e24df5ec3059dd46866930ec4bb10d576515dc5bdad7f0e3b9c

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