Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a9b7fef8266cf9…

MALICIOUS

PDF

82.9 KB Created: 2021-03-18 23:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 33ff3e7d2a45aa7b26fce34d6c374114 SHA-1: d121cddcd8c64006a49cfd006be3980b2eecdaea SHA-256: b5a9b7fef8266cf93ab13bc54832b59de46eb5a1333fa0c309bc0396691b7abb
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, 'https://soxebez.ru/strik?utm_term=how+does+the+couple+next+door+book+end', is flagged as unknown reputation and is likely the primary malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://soxebez.ru/strik?utm_term=how+does+the+couple+next+door+book+end PDF link annotation
    • http://ludirobus.getenjoyment.net/xanutelamawubojuminupuwe.pdfIn PDF document text
    • https://gijidibeb.weebly.com/uploads/1/3/4/7/134702067/rolenuxuj.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/towuxinobub.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/solidworks_assembly_exercises.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/degasupuwapej.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/11942515112.pdfIn PDF document text
    • https://fufifodex.weebly.com/uploads/1/3/2/8/132814348/8954186.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/padosumifubobo/apostolic_pentecostal_sermons.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/26607313654.pdfIn PDF document text
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_514005d72813478f879afd52421909d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jimugivos/ruboxoduralamadubex.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/26343681088.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_b7e9afd913c84a3e960178ccc27b6bd8.pdf?index=trueIn PDF document text
    • http://widepidaba.atwebpages.com/31904556817.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_d2a42a0dc5dd413498425b20220de0b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/49414579058.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_8aadc26a68e847378a9126881f5df07c.pdf?index=trueIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_d5bd32494c264421b67374aaa2861059.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/lg_message_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/libro_matematicas_2_calculo_integral_larson.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_2b063ded1e714af299372140756f0f67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/affordable_luxury_sheets_target_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/american_truck_simulator_apk_2019.pdfIn PDF document text
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_8fdea14184c547aea347e257cc050d5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/wildgame_innovations_digital_timer_problems.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_502169a5cdc74fa4831bcdd02ff62539.pdf?index=trueIn PDF document text
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_1027e7c230f04e3f8e0765d9b5317822.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_866abf7c05594eda88d19253c3378cc6.pdf?index=trueIn 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_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 5276 bytes
SHA-256: 2083997908630d17177d3b914af9820c12397cfe530fb231990c283221538090
font_01_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 10712 bytes
SHA-256: 1badb8af27d29fef95e7e426c933260a2430cd3e2bbf9e9b5d9c456f59ed1830

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