Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52d43bda70d4ab2…

MALICIOUS

PDF

68.5 KB Created: 2020-12-10 21:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 689fdc7e67682a7b629ba8bcfffbf470 SHA-1: e87b921f50a4bbcb77331ee17435590918ed75ab SHA-256: f52d43bda70d4ab2f5e895e0e69b40543f0d1749ca617c6d1a8271b7250bf367
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is identified as malicious by ClamAV and an ML classifier, with a heuristic indicating a visual download button lure. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of a download lure and the external URL strongly indicate a malicious intent to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=clustertruck+full+free
    • https://cdn-cms.f-static.net/uploads/4473903/normal_5fad4dcf216e0.pdf
    • https://cdn-cms.f-static.net/uploads/4386618/normal_5fabacc9557f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6e08a67b-3837-4067-b7fc-ac78e0ef139b/gerabakidazugogu.pdf
    • https://static1.squarespace.com/static/5fc0e15d7d0c8f249d40b1da/t/5fc11fd33f75b16643fc3729/1606492116696/pueblos_de_puerto_rico_con_la_letra_e.pdf
    • https://static1.squarespace.com/static/5fc5c64d3dfdd95b60f68ae3/t/5fd03f6151357b44bb8affd3/1607483234790/quiz_for_disney_fans_free_trivia_game.pdf
    • https://static1.squarespace.com/static/5fc1ceb7bdb33045eec8b031/t/5fc2ea5bcb3e0f5771b0b01a/1606609500312/rudyard_kipling_east_is_east_interpretation.pdf
    • https://uploads.strikinglycdn.com/files/137cb416-808a-4463-bd00-c9356f29275f/five_nights_at_bendys.pdf
    • https://uploads.strikinglycdn.com/files/ef0fd877-bb3f-4228-88ff-3bbfecde3ff4/college_sight_singing_examples.pdf
    • https://uploads.strikinglycdn.com/files/038c3942-ac21-43a2-afdc-fb6d194c400c/lapotabuni.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c91c.bin
1537d1a957ffce3aaf94625959dad22a1abadfeb773c85cf58965e6f4be00780
pdf-font-stream PDF embedded font (sfnt) at offset 0xC91C 4632 bytes
font_01_sfnt_off0000d8e5.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 1800 bytes
font_02_sfnt_off0000e173.bin
7f272e89d883372df6093fdb934f9a53a42713a847faece58f71488140e3096d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 10696 bytes