Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd3841c5a1ef679…

MALICIOUS

PDF

86.4 KB Created: 2021-03-25 13:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9529e0bc33536d095299e3fe25427352 SHA-1: db9675d1698b1396b9b6735c0eb8c5d539344330 SHA-256: bbd3841c5a1ef679766589f4517a06943fd295ffdcd7744f89ef9d9da8428d09
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, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a phishing lure or download a secondary payload. The document body, though heavily obfuscated, suggests a pretext of providing an analysis of 'Soneto clxvi'. No scripts were extracted, but the presence of an external URI is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=soneto+clxvi+an%25C3%25A1lisis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420743/normal_6039e7d02b1f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_60355121306fd.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/Kielor6/87783163219.pdfIn PDF document text
    • https://cdn.sqhk.co/xozirijor/1ghyyjb/tijef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_60254176dd9e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460043/normal_5feb715d21370.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/LyKjehe/word_puzzle_games.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/bibejovixapis/best_mods_for_2019_mustang_ecoboost.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/28271904593.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/35012988932.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/72177062299.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/14116368137.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/cellist_at_royal_wedding_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/46207027621.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/41011336256.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/94670415796.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/54867524402.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/arsenal_vs_burnley_2_1.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/nguyn_ln_v_trn_c_tho.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/bostitch_sb-1850bn_psi.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/48653757860.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_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 5160 bytes
SHA-256: 1e9bf03002bd43d8cdb6141a23a6c971bed0c4a1140e6ef1e7a097d7bb0119e5
font_01_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 13680 bytes
SHA-256: 44aeb83fea134f707106a10cf96b953a80755e52f6043c22ef4142f98dcaa869

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