Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d13b668982cf4c3…

MALICIOUS

PDF

74.0 KB Created: 2021-05-13 12:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58405eee5c1c7ad32b25763be1e1aba3 SHA-1: d1277e03689e52c8663d5e32d96a5be74f571042 SHA-256: 8d13b668982cf4c3db8a02f1e5dfff00fe9b8dc0d4b6eb24e4b8ae5e04c6b77c
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and one of these links points to a suspicious domain. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a pretext for delivering a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xezojetit.ru/strik?utm_term=resumen+de+trabajo+ejemplo+en+ingles
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/6840811.pdf
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/9986658.pdf
    • http://zulesaxeririv.sportsontheweb.net/career_interest_survey.pdf
    • http://markettop.pro/danitoxonav9gwz1.pdf
    • http://vavexefane.mypressonline.com/dofofexaw.pdf
    • http://bitcoinlearningcentre.online/840625009364ycjr.pdf
    • http://tujidal.mypressonline.com/mifuke.pdf
    • http://haifaiv.ru/dobusovenudokipiperaximo5qiiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a811059-5e7b-4c8a-81fb-612047614f4b/nanagoxopavukatel.pdf
    • https://uploads.strikinglycdn.com/files/ff359516-95b4-48c1-8ef4-1961ac3d412d/speed_queen_dryer_error_code_eaf2.pdf
    • https://uploads.strikinglycdn.com/files/78818ecf-03a8-4407-9d48-b665837ad529/free_romance_stories_to_read_online.pdf
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_7e388ef2a9ac401680db078e92ee7108.pdf?index=true
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_0a99b995c64244f58128b889709140d3.pdf?index=true
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_89664a25362040db88c387ccd635eeda.pdf?index=true
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_45cd9a4939b8450fa8c482c5172544f9.pdf?index=true
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_ca53648c9c704fbb8bf378f037e976b7.pdf?index=true
    • http://tinulelor.rf.gd/allure_report_plugin_for_jenkins.pdf
    • http://zowuxepalaget.epizy.com/79589118270.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_off0000e1ed.bin
bd76cd6dfe14ada006123c0bd114408c0691b31d447d6c3fe3a59c52e4f2f445		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 5504 bytes
font_01_sfnt_off0000f48a.bin
ecf85d35e927d488f0a6fde55edade81b43fc1d02bb67ff5edef45df3f2a7605		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 11304 bytes

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