Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd85cf3a8ad2c9b…

MALICIOUS

PDF

72.9 KB Created: 2021-02-19 08:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ce2d6afa25b51a5d6dcd463416216ad9 SHA-1: bd4f880a2daec268687f0883adf4012a2217b5cd SHA-256: 8bd85cf3a8ad2c9bdd801afbd2747998c74ae1524be65b946b7937f050421e69
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URLs, including one on disposable hosting, and a heuristic for a 'download button' lure suggests this PDF is designed to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=kendal+ultrasonic+cleaner+hb-4818t PDF link annotation
    • https://cdn.sqhk.co/modajili/ggiihbE/88584098753.pdfIn PDF document text
    • http://ins.expert/how_to_get_hipaa_compliance_certification63fb9.pdfIn PDF document text
    • https://cdn.sqhk.co/rojotuwo/jeIVgiq/poweramp_equalizer_xda.pdfIn PDF document text
    • http://pubgmobiie.com/torque_prokwi3y.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/bdbehbx/maze_runner_maze_wiki.pdfIn PDF document text
    • http://cuzinfo.ru/88675037686nu7gu.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/hejghhR/hitman_3_trailer_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veramok.rf.gd/gipavamajos.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/temoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/baldi_s_basics_game_no.pdfIn PDF document text
    • http://bozexobasunuz.rf.gd/referencias_bibliograficas_apa_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/33363253732.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/fizobaxodilavodoxadituzak.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/fm_whatsapp_new_version_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 5504 bytes
SHA-256: c2acf1ffc38478d71269dd3f8011dc31c92bb720f8a101bd8b04fd19622a5e9f
font_01_sfnt_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 2448 bytes
SHA-256: c151941a84722c0c96fa97d54a7bec663a24106f2f29828e870c7bbcbabf0406
font_02_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 12472 bytes
SHA-256: c5211d1447529660e123ccdf585885738348c5f7707a1319b7b97fe662dbca63

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