Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac97b2ec8c1d8e8d…

MALICIOUS

PDF

77.4 KB Created: 2021-04-26 03:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: be3a044efca2b0faf1046666c8e0afc3 SHA-1: d180d3639d20d99b40ef013530cdc17fe9660617 SHA-256: ac97b2ec8c1d8e8dca6bb4e6ddbc8783fc25e13251dea9d763c9dd42073cb7d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to a search query, further supporting the lure aspect.

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://fokemale.ru/strik?utm_term=how+to+blow+up+a+lay+z+spa+st+moritz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403688/normal_6030980c72a92.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/jdRkKAd/renofunanafuwokuwidilusiz.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/zewanosobotak.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/i_pace_max_charging_speed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_605919e544e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_605daea6243b7.pdfIn PDF document text
    • https://cdn.sqhk.co/voravaxa/bszhdic/commander_in_chief_mediterranean_fleet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f49e5fef-b19e-4474-900d-1512bb686acb/zimafogipegabexujaza.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/tazarewarirefotemado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199efcd8-435e-4b35-8b0e-a34193c1ab6b/usarec_3.3_example.pdfIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/gufalujelir.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/exclamatory_sentence_example_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f5de5c-8853-47ef-afca-6e1b0ace3edb/can_a_ford_ranger_pull_a_truck_and_trailer.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/69184963589.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/vugepobajamojivonalig.pdfIn PDF document text
    • http://judiserod.onlinewebshop.net/8163095747.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/navy_chief_eval_closing_statements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e8c05e-3f4d-4c96-a7be-d0beb9c9f39f/hp_officejet_6500_e709_wireless_setup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 4968 bytes
SHA-256: 43b8137713a2dca61ddf7ea315cfd0ad0a69f513f838e281713f2cf97df222f9
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 11008 bytes
SHA-256: d741f6e30373d871ff72dacdf2a36ce0ea8d33099634db73d7a4955bf8ae46a9
font_02_sfnt_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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