Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4694c3f8e80208…

MALICIOUS

PDF

81.9 KB Created: 2021-03-31 13:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cadaf932adfedb23fd3aadf4b4c9b390 SHA-1: 5800edb10161fe7f09209563b3bec4ad3e530cfe SHA-256: ad4694c3f8e802081114842498996d2a303fd4c3cae2c421bde62837d40923dc
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, appears to be a lure related to academic analysis, directing users to external URLs. The presence of multiple external links, many hosted on disposable domains, strongly suggests a link farm or redirection scheme designed to lead users to malicious content.

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 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://vilenefex.ru/wix?keyword=the+secret+life+of+walter+mitty+literary+analysis+answers PDF link annotation
    • https://cdn.sqhk.co/xekobigi/haKphfs/nisasixovepifoxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413458/normal_5fc697a17c3c9.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/how_to_start_artificial_intelligence.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/4nCtgdx/tafulukazit.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/ati_books_app.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/carpal_tunnel_release_exercises.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/61737796535.pdfIn PDF document text
    • http://zowogusatutojus.mywebcommunity.org/90812921431.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/jtqIjjN/susajakafibotetisebixobep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_605c3bfc4d274.pdfIn PDF document text
    • https://cdn.sqhk.co/fowoleleda/jN78hav/rarage.pdfIn PDF document text
    • https://cdn.sqhk.co/satofapo/ggdZha5/53823861206.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/fedufiporara/bss_full_form_in_medical.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/basic_concepts_of_stock_market.pdfIn PDF document text
    • http://bozexobasunuz.rf.gd/dazasamafutajufakirupex.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/pijefurubepedixowiwidatu.pdfIn PDF document text
    • http://tubupokus.rf.gd/best_android_call_blockers_2019.pdfIn PDF document text
    • http://pekomuvave.myartsonline.com/hp_photosmart_plus_b209a-m_not_printing_color.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/neratemurebijusipel.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_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 5264 bytes
SHA-256: 6e42583021c5067163a6678cc9e69280deb60edea9a322d7fa43b51fa8526f2b
font_01_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 11264 bytes
SHA-256: eb538bfdbfc1810941b6b4f4d43bc39e70ca35de00085443a5ff9e3398cad580

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