Malicious PDF — malware analysis report

Static analysis result for SHA-256 8840807b9025594b…

MALICIOUS

PDF

82.7 KB Created: 2021-03-30 23:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b70f2a09460d19e03634bb58969d156 SHA-1: d0549fa65d3fd149788872befcd93343d6d5402c SHA-256: 8840807b9025594b1ce9dbf08fbb0cbed792b767d1b6b7023be8ef6d46e8beb3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=what+is+the+rarest+penguin+species
    • https://satomasutal.weebly.com/uploads/1/3/2/6/132681949/xizebivo.pdf
    • http://blancop.xyz/revamw746v.pdf
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/45367227e.pdf
    • http://shop50off.info/formatting_excel_spreadsheet_to_printm4ctg.pdf
    • https://cdn.sqhk.co/bupusudiva/HigTii3/70948086146.pdf
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/xeroxajaj.pdf
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/2082382.pdf
    • https://cdn.sqhk.co/wujejelot/f55aOnm/84625085898.pdf
    • https://cdn.sqhk.co/benadujeju/njagh2J/guided_train_tours_of_scotland.pdf
    • https://jikezukirex.weebly.com/uploads/1/3/1/3/131383594/xaxadifixeg_tudabulalexu.pdf
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/savokuzom_fifagotopo.pdf
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/joxijiperamedalapi.pdf
    • https://lejujazu.weebly.com/uploads/1/3/5/3/135337057/924f8f.pdf
    • https://xanovisawedota.weebly.com/uploads/1/3/2/8/132816091/4146910.pdf
    • https://cdn.sqhk.co/kizusuvut/NpPGzhd/top_new_ringtones_zedge.pdf
    • https://cdn.sqhk.co/tavikalamo/jh37k6V/zisexarupawafabuta.pdf
    • http://specrazreshenie.com/unibet_app_for_androidf5jpn.pdf
    • http://wordsidepost.top/zemuvabunuf09ego.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8a2be734-2065-44ff-bbf9-7a1e1a16c159/mcgill_university_gpa_scale.pdf
    • https://uploads.strikinglycdn.com/files/6fc6e097-88b9-4242-b4da-9595a6684d55/hp_photosmart_plus_b209a-m_ink_cartridges.pdf
    • https://uploads.strikinglycdn.com/files/43e390f4-12fe-4dc0-b1af-d748a6fbb43b/10715496751.pdf
    • https://uploads.strikinglycdn.com/files/dbb16116-d405-4fca-8d18-77109c2c74d1/nopotub.pdf
    • https://uploads.strikinglycdn.com/files/5daf54f0-63d5-4252-b434-f5c94f06b4f4/what_does_service_airbag_light_mean.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_off00010416.bin
c505c0fb07c0f547358bdcd63e8f421bf08f43d7699e3b147603ff9984406077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 5176 bytes
font_01_sfnt_off000115be.bin
418b2213c0ad722ee064586bb0f8fd23210f2464ae69ec80dbaa93bd055a8a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 11616 bytes

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