Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1fbeaf5bfecdeb…

MALICIOUS

PDF

90.6 KB Created: 2021-02-24 18:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c2aa591bae82504ef963e3517f6ca291 SHA-1: 4d367973016686e6fca14ed526a19cf7a1b6a146 SHA-256: 2c1fbeaf5bfecdeba1a6396fb36dfd41f293771a4f2331533da6e6da31a39035
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to "fast addition", aiming to trick users into visiting the malicious URL. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=how+to+fast+addition PDF link annotation
    • https://cdn.sqhk.co/govuzupikiwe/a7Bhhhj/20743691715.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/jchbhhy/hashtag_generator_instagram_app.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/aidhcnp/samipaxanulutexavufe.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/jjjih2P/werewolf_art_phone_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/cyxVH2K/launcher_windows_10_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/dhfhfY2/rikanajadukejivolalepeg.pdfIn PDF document text
    • http://hhizmet.com/48310343842dw0te.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/ijkjcgg/96414917352.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/how_do_you_whitewash_with_chalk_paint.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/folexapurilowe/9348773014.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/17089593100.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/flyer_psd_template_facebook_cover_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/dj_mustard_ft_roddy_ricch_ballin.pdfIn PDF document text
    • http://widifusi.myartsonline.com/xaviera_hollander_libros_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/tijidaparovomor.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/fijab.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/aiyyaa_movie_songs_ming.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_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 4824 bytes
SHA-256: 5ce8269f7aa381c4c97bb949636fa014e23fe9d909e104c5c069053ab814b961
font_01_sfnt_off000136d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 11408 bytes
SHA-256: 2e58d629ff787079021833abe504e117c7359eff8ad2a5f0e2ff03a357c0f9df

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