Malicious PDF — malware analysis report

Static analysis result for SHA-256 464f48be0097978d…

MALICIOUS

PDF

110.8 KB Created: 2021-01-21 08:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 31aa3ba75cd85fd17b3ba7f3f031fe7a SHA-1: 21b3c34af7bbfc849424eab271302eecd4fce108 SHA-256: 464f48be0097978d02d8cbd690b1265938caf08813c5fe9a649f97e15b2738e4
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and the ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'biology chapter 4 section 2 study guide answers' to entice users to click the external link. No scripts were extracted, but the presence of external links and the high confidence detection scores suggest a phishing or malware distribution 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/123?utm_term=biology+chapter+4+section+2+study+guide+answers PDF link annotation
    • https://site-1172464.mozfiles.com/files/1172464/41104262018.pdfIn PDF document text
    • https://site-1178488.mozfiles.com/files/1178488/furniture_for_sale_by_owner_craigslist_okc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd64551e3dbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419001/normal_5fe02be1c5083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413457/normal_60053a234e9df.pdfIn PDF document text
    • https://site-1249973.mozfiles.com/files/1249973/tamil_dubbed_animation_movies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fed3dd81b82c.pdfIn PDF document text
    • https://site-1167993.mozfiles.com/files/1167993/5780867589.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/restore_my_all_deleted_photos_free_apk.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/govawivuwovuvuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_5fbd7fa05d170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492875/normal_5ff1c5caeb4d4.pdfIn PDF document text
    • https://site-1245124.mozfiles.com/files/1245124/anganwadi_job_form_in_delhi_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5fa55df4eeaa3.pdfIn PDF document text
    • http://lusoxokurutugap.22web.org/good_morning_photos_hd_gif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5faec5cccb740.pdfIn PDF document text
    • https://site-1174133.mozfiles.com/files/1174133/best_where_my_android_app_for_video_editing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379234/normal_6001283e5ea8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopagozijudiri.epizy.com/gazibafevuladuselav.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/ring_savvy_inc_answering_legal_inc.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F69 5796 bytes
SHA-256: fd3bd3b38c3088ba96b9b39c541e5a4be6ddca755f34ca8d5688698a37d3493b
font_01_sfnt_off00018341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18341 12608 bytes
SHA-256: 8fb81a1f5544d87a3006d6901aac9b4ef31a7c6e62a3a87dc3e8c639d45ef678

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