Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1995bbea35a0449…

MALICIOUS

PDF

63.7 KB Created: 2020-12-09 11:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 445d9b8a5617d10f237c2cf022dea51b SHA-1: 7f8c2196255b6d4b9f33cfbd248063070f517893 SHA-256: c1995bbea35a0449f3c5a7e9f20cd473ae29cb6afde5de6b0223c9e0fe681b99
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the embedded URLs, https://trafficel.ru/123?utm_term=lynyrd+skynyrd+simple+man+chords+tabs, is suspicious. ClamAV also detected this file as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and link farm suggest a phishing or malicious redirection attempt, likely delivered as an attachment.

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 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://trafficel.ru/123?utm_term=lynyrd+skynyrd+simple+man+chords+tabs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366063/normal_5fcba90b8b8f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f90821280b03.pdfIn PDF document text
    • https://ropesafubisok.weebly.com/uploads/1/3/4/5/134515157/7457740.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/henghuili-files/linof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fcd187f-f940-4be0-bc66-471828b77344/jet_force_gemini_n64.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b247d5e-6371-4e51-98da-6a659ac92bbf/download_mod_apk_subway_surf.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/17986939949.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/videoder_apk_2018_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/paas_aao_na_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/border_movie_theme_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/bluetooth_software_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/naming_branched_hydrocarbons_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/play_bubble_shooter_online_free_no.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB36 5560 bytes
SHA-256: 0cd4d066137e4df4ec16207e6da655974ddb05f38a04bce2c93fbc72aa9d51ad
font_01_sfnt_off0000cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 10532 bytes
SHA-256: f11c54f5866cd514bda0bd7f327e6588addb6e33e513176bb73a392a85982d19

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