Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf5c9167133e9c5…

MALICIOUS

PDF

73.9 KB Created: 2021-04-02 02:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f58d68bd87c72f1a10a7390194b113cb SHA-1: 7d6543085db14c496b630b9ffee4226c12d250d3 SHA-256: 7cf5c9167133e9c566e5d0ca3323dede9fb33b34d7761bebbc409b9b7f3f028a
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'chemotherapy'. No scripts were extracted, but the presence of embedded URIs and the overall detection profile strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=what+is+chemotherapy+for PDF link annotation
    • https://cdn.sqhk.co/bexefoboxevi/Sfgizgd/matopujotazikid.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/jfuYZgd/remopexopem.pdfIn PDF document text
    • https://cdn.sqhk.co/dobajinorite/fgfjcYn/santorini_grill_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/kibukumivu/aPYhj5O/alberta_map.pdfIn PDF document text
    • http://apkweb.net/apollo_twin_duo_mk2_price_in_indiav5mhg.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/gnhIIq6/raid_shadow_legends_script_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/bpQTggF/rakemigod.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/R6hdcnO/outdoor_movie_night_party_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/bjbgche/kibuxuwinewumujamaxam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369516/normal_5ffd00777a27a.pdfIn PDF document text
    • http://women-ita.space/jezavigovasugug9chzx.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/ahgvmgg/target_bow_stabilizer_for_sale.pdfIn PDF document text
    • http://sungo1.space/invitation_letter_for_meeting_templatef5zb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_603b43b69fbee.pdfIn PDF document text
    • http://lnstagramsecurity.net/kubota_v1505_engine_for_salebxk7r.pdfIn PDF document text
    • https://cdn.sqhk.co/bexikerez/jePheg0/chris_young_songs_with_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/tKt1ij0/vedematalelozoran.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/Gjgeu2t/63587178342.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/h7uXSjd/cnc_programming_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/jin3hjp/bengali_dictionary_java_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/TphjiaA/57229786356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 5336 bytes
SHA-256: 6240fe3a4354a55c6d0abc574548e3c8d828dc797153cd3f2ca091357b44640d
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 9816 bytes
SHA-256: 9d60a776251052224dfd2465d7c5832249f3bcaac825290901541703ccde5c6c

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