Malicious PDF — malware analysis report

Static analysis result for SHA-256 b526dd038a76eac1…

MALICIOUS

PDF

74.5 KB Created: 2021-02-02 09:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 74c9186b3a4281cf5d208099f8858fed SHA-1: df1ed7abb98396ba67a2906b7226c3b92d04794a SHA-256: b526dd038a76eac17c4a68094ed5a804c7a6337c6ed25ea9dc6e2d854a948274
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, likely serving as a lure for users to download further malicious content, possibly related to software updates like 'Adobe flash player'. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

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://crophysi.ru/aws?utm_term=adobe+flash+player+android+4.+4+2 PDF link annotation
    • http://latencfsrt.space/ethiopian_grade_12_technical_drawing_textbookb2byr.pdfIn PDF document text
    • http://j3vnci4.xyz/terraforming_mars_colonies_project_cardsbpync.pdfIn PDF document text
    • http://milky-rp.space/6354037491pk0ji.pdfIn PDF document text
    • http://velesvoyage.ru/25251836490ox1hh.pdfIn PDF document text
    • http://podarokinsta365.site/dictionnaire_medicale_francais_anglais75ph1.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/xhghdFZ/nda_example_uk.pdfIn PDF document text
    • http://nikaold.site/tapawesagapiteduzasefonuj5hnq.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/jd2Hvig/vivuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/tid4ngh/paper_bowling_pin_shooting_targets.pdfIn PDF document text
    • http://connexion-amelii.xyz/ainp_012_formo9rdb.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/wixanarer/carnivore_herbivore_omnivore_teeth_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/fajuven.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/lol_tft_cheat_sheet_9._16.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/blur_background_image_in_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/ar_rahman_tamil_movie_video_songs.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_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 5612 bytes
SHA-256: 597ceb2ca68dda146a928bd577ca5229c76c8048a17ec7bb97dda0e414c36fc2
font_01_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 10736 bytes
SHA-256: f0bf7d399037f2fb45b9eb2c633ad002145bff12e052ec62274c6a684afad4bb

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