Malicious PDF — malware analysis report

Static analysis result for SHA-256 df944c75674fa517…

MALICIOUS

PDF

87.5 KB Created: 2021-05-12 06:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d286ae02561a89c054e090d7e54fe464 SHA-1: e0669b4f081a2cdceb0fc855cbc5836fb47c9b05 SHA-256: df944c75674fa517d52aadc6e4f58c3200ed2b9d49bbaae64e4e98aac78c4e3e
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary IOC being the external URLs used in the link farm. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+get+used+to+a+new+pair+of+glasses
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/detekop-nozot-zifaromiso-fijepamurazeji.pdf
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/fa5c7ac7e.pdf
    • https://cdn.sqhk.co/xavipinav/egiidwo/jefavafipofitokivisoweb.pdf
    • https://zoredufuno.weebly.com/uploads/1/3/4/6/134638801/tuwak-mijowatamil.pdf
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/fukoweripujif.pdf
    • https://cdn.sqhk.co/welosezu/bJFhcjd/what_was_the_russian_civil_war.pdf
    • https://jelebemurufipo.weebly.com/uploads/1/3/4/4/134442628/dipez.pdf
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/699541.pdf
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/9533358.pdf
    • https://cdn.sqhk.co/mejeteboxav/jjj6ige/wapizotozabe.pdf
    • http://luwinilulurop.mywebcommunity.org/antiepileptic_drugs_in_pediatrics.pdf
    • https://cdn.sqhk.co/kixagixupo/WCxyjhQ/tonad.pdf
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/vogijomo-vokamifowexif-lidov-lesowamijib.pdf
    • https://jipoditilab.weebly.com/uploads/1/3/1/4/131407274/e3547d11.pdf
    • https://mologikonazo.weebly.com/uploads/1/3/4/7/134706863/3290910.pdf
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/28188.pdf
    • https://cdn.sqhk.co/mekurapiw/fPja1gc/is_bomb_tower_good_clash_royale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://koxolavomuzo.myartsonline.com/how_to_cite_a_poem_in_an_anthology.pdf
    • https://uploads.strikinglycdn.com/files/7a15d740-494e-4d52-bbe8-974b7f99c06d/47654320813.pdf
    • https://uploads.strikinglycdn.com/files/343f294b-cd0b-42fb-97a1-3854fac91f85/html_language_book_free_download.pdf
    • https://uploads.strikinglycdn.com/files/4f1e4d62-d677-4bf5-a91c-96c51a6d5340/13286461882.pdf
    • http://sajulugebimisu.myartsonline.com/lexus_rx_350_for_sale_by_owner.pdf
    • https://uploads.strikinglycdn.com/files/106e6995-f3cd-4c59-9deb-5a0fc70362b9/how_do_you_make_money_on_youtube_or_instagram.pdf
    • https://uploads.strikinglycdn.com/files/9c066636-2143-46f8-b8a3-fa90b82ef560/how_to_find_pilot_light_on_gas_fireplace.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116f1.bin
92bebfa34cf8093c32498bf951385ab4203f3390290541a6ef1936a3d5d8ef58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 5260 bytes
font_01_sfnt_off000128fc.bin
100a0342bac8c33e1f6c758fa0ebd60c12a77adb788191f181ca18b52218a831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 11448 bytes

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