Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7e51274a088fcc…

MALICIOUS

PDF

80.6 KB Created: 2021-04-04 16:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0c2b22e419980ba407d0a3991092f9a2 SHA-1: dd36bce22eb8c20467e36db2d5d8b506548889a2 SHA-256: cd7e51274a088fcc42468ddb2bd5b3b0253ae79f812030fa92a1d3d8f40b20c1
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 0.9998

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://kuzutuzo.ru/wix?keyword=how+to+conclude+a+narrative+essay PDF link annotation
    • https://cdn.sqhk.co/zenegiwowi/CVJU3hd/26026745693.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/n53agcS/deezer_nextbike_berlin_kosten.pdfIn PDF document text
    • http://bejozenofidon.22web.org/mefaxavowirunegitiwub.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/hemlWFn/ghost_killers_vs._bloody_mary_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/Cjahhic/64667431942.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/Tvgc5FZ/xeronuxapowusala.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/fWgcggS/defender_90_interior_roof_lining.pdfIn PDF document text
    • http://wapuwesifatirok.iblogger.org/all_album_songs_isaimini.pdfIn PDF document text
    • https://cdn.sqhk.co/femelofep/gh7krgc/pink_piano_aesthetic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_600e218f51288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449422/normal_5fc9e1e295fd2.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/zcjiMii/hot_stepper_meaning_british.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_6d95a1da779e417ab1b8acc8dfb2d8e3.pdf?index=trueIn PDF document text
    • http://pogebikaku.epizy.com/participatory_action_research.pdfIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_90f6dc95787a4cfc9ad446aa120d7761.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_9cdc90112c1e4a468b341c0070027f3b.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_97053613f9944e90a98003b07ec63ee7.pdf?index=trueIn PDF document text
    • http://fofeparulofiz.rf.gd/sifuzura.pdfIn PDF document text
    • http://ripivetozevulu.epizy.com/apache_tomcat_6._0._45.pdfIn PDF document text
    • http://towixamum.epizy.com/7486784325.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 5148 bytes
SHA-256: bcd41c48a0b7d48374384c2e3146da2b5ceefc5620ac6e2ec992877c24fd08f3
font_01_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 10932 bytes
SHA-256: 2913c18bddb2c8bd34b3bb8f678e235f1c4f3757969a83b2ffe93a8ce9ba57e1

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