Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3967c0e63115554…

MALICIOUS

PDF

64.1 KB Created: 2021-02-25 11:04:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 168c5b1ad22e4272a9bdd86f49e97779 SHA-1: 1cff914b92846671d90f7b1449640fd216bf9d85 SHA-256: f3967c0e631155549bdb3f5989ccd2618b239c4c457ba2b2d86cfa517245365a
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'Fake CAPTCHA' heuristic strongly suggests the document's intent is to deceive the user into performing an action that would lead to further compromise. The presence of numerous external URLs, many hosted on disposable domains, further supports a phishing or malicious redirection scheme.

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • 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://bologen.ru/award?keyword=bunker+hill+safe+45891+reset PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448332/normal_5fe90d71b7323.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/the_one_real_thing_espaol.pdfIn PDF document text
    • http://tehnoprom.org/app_trailers_hack_apkpucxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_6018e59e1490a.pdfIn PDF document text
    • http://daimontimur.org/chemistry_practical_book_for_bsc_1st_yearjp3f0.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/nikon_dx_vr_battery_charger.pdfIn PDF document text
    • http://yazansoft.com/44177739024bk5il.pdfIn PDF document text
    • http://levinorutuw.iblogger.org/limarijilotojal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_600a11263ced0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502563/normal_5ffcd8918e1cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375690/normal_5fcc804eac7a4.pdfIn PDF document text
    • http://geminomigokur.iblogger.org/boardman_tt_bike_size_guide.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/sesijesule/pdf_to_word_converter_paid_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/krewella_alive_piano_sheet_music.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/what_country_is_the_sun_rising_in_right_now.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/my_talking_tom_2_hack_mod_apk.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_off0000bf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF95 5584 bytes
SHA-256: 5f2e39dcadddf19fb6c5d37f379f179f73ed1a148cafa9ccc04f298db05371e8
font_01_sfnt_off0000d29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29B 9780 bytes
SHA-256: b16b3f989a3ac5551acb783a17107d8427e97d084a972d21333448f7b9b2d2cb

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