Malicious PDF — malware analysis report

Static analysis result for SHA-256 9702db3bc3177518…

MALICIOUS

PDF

83.5 KB Created: 2021-01-11 07:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c911acda191f0f91f78c96ddb21482d3 SHA-1: 961b480e60837b1442af32f146314e8e3792acd7 SHA-256: 9702db3bc3177518259b3027dc7068af5fcd0ca7135a8036dc50f0bdffcd0c4a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV and a machine learning classifier as malicious. The PDF's content, though heavily obfuscated, includes references to 'Android mobile' and a URL that appears to be part of a phishing or malware distribution campaign. The presence of an external URI and the high ML score strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafffi.ru/aws?utm_term=android+mobile+5000+to+7000 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423772/normal_5fafe52ae9e24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5fb834df9fe27.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/pidjcji/fingertip_pulse_oximeter_readings_pi.pdfIn PDF document text
    • https://site-1177929.mozfiles.com/files/1177929/dj_name_mixer_app_download_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5fdda549c2413.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/1ibiigd/movigigapajimiwe.pdfIn PDF document text
    • https://site-1168006.mozfiles.com/files/1168006/world_war_3_movies_on_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/GTIibN8/kipamifupojuwusidifapipi.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/jiianft/dunk_lords_xbox_one_multiplayer.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/tezude/complete_subject_and_predicate_worksheets_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/nonawulo.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/zijujikevitakelukasi.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/jebewemujovu.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_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 5060 bytes
SHA-256: d6458868072aa0323b1fa68c0ae20b10d2084e47cc196a7253ab0ebd870fd677
font_01_sfnt_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 11388 bytes
SHA-256: 79b986c3742d0381e94f97de83813c8b6f7e6699e902095a612c1d2912159861

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