Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f54c5902d139ec6…

MALICIOUS

PDF

70.5 KB Created: 2021-02-27 14:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 496ec976533a543ca1c0365fcdadebbe SHA-1: 27ba2034600f0057dfcb9d75ee3a2b564e3f4bb6 SHA-256: 5f54c5902d139ec6f1c9ffe9e6ccf30d962161eb4d4ba19f687e3393a2f2b762
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate malicious content. The document body, though truncated and obfuscated, mentions 'dt466 turbo rebuild kit', likely a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://xezojetit.ru/award?keyword=dt466+turbo+rebuild+kit PDF link annotation
    • http://gajaxujifusokul.mygamesonline.org/when_did_john_owen_wrote_the_mortification_of_sin.pdfIn PDF document text
    • https://rojofasefimo.weebly.com/uploads/1/3/1/6/131636828/2ebb08bfbd08.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/is_watchmen_kid_appropriate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482191/normal_60006f5e380f3.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/zapazixanosa_xabofowabopenar.pdfIn PDF document text
    • http://negeduji.66ghz.com/ashwathama_sacred_games_free.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/lijirur.pdfIn PDF document text
    • https://sowujapureku.weebly.com/uploads/1/3/0/9/130969862/tanemovu-zitesirodig-toxikepuzufus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5fd349d83c3cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_600ae1eb9ee68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_6017bc78877e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/faded_piano_sheet_music_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/28074795223.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/2373088940.pdfIn PDF document text
    • http://mazolofoju.epizy.com/wuneza.pdfIn PDF document text
    • http://sosozodazu.epizy.com/fibre_cement_sheet_sizes.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/cours_tronc_commun_bac_international_maroc.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_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 4876 bytes
SHA-256: 1fca1e85dddb882fb6c17a0537806046e3c68647043c50f20323cfbd73db0f4b
font_01_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 14916 bytes
SHA-256: 98b5d1026e9db8d1ea3be8a8207c07e546359b802731c432be517f4fdab7baa1

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