Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d896ab3206e4e6b…

MALICIOUS

PDF

87.8 KB Created: 2021-03-16 11:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a26cdaee85577c81f53ea9658bcad7f SHA-1: 15cab5578d04a29b35862c8fa40ad35c636e896d SHA-256: 1d896ab3206e4e6b42a654aa3fb9bae29948219423a45657b3d201cc8bd6c5fd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=xps+as+3740+pdf PDF link annotation
    • https://fiferogupinuwa.weebly.com/uploads/1/3/5/3/135306016/5336320.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/iOgcjf7/24709315698.pdfIn PDF document text
    • https://cdn.sqhk.co/mutobudenit/gg0pfgj/nageled.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/Jlggihb/radedakulumulebaneleju.pdfIn PDF document text
    • http://zilofunawoson.iblogger.org/what_is_convolutional_neural_network.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/UhfDhal/xekagisiguv.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/icibtQu/rodogeko.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/c7hbie0/download_remix_maker_for_pc.pdfIn PDF document text
    • https://menimewutezosel.weebly.com/uploads/1/3/3/9/133997121/3a01ffd60ac16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_60356cd294e62.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/TTidlhj/whatsapp_messenger_download_for_pc_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/daicgf6/radiation_city_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_604f6d12ae706.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_45bc67ef97044e8fa2055008b443a4b1.pdf?index=trueIn PDF document text
    • http://fatewazut.epizy.com/is_arris_tm822_a_good_modem.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_a04483b8d3df483eb44447aba9ca9510.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_aa4bb687b4c241e596e041c8fa09a909.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 5356 bytes
SHA-256: ba57b0c0dc9aff48b2b3aa150d0b7b5f0ac0e2e9c061075ada5c59b469073e9e
font_01_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 25992 bytes
SHA-256: b8e1b13a193774ef75114b8209978e89453cf9715da16c76c28aec47278a6201
font_02_sfnt_off00013bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAD 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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