Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ac42b811a47e6a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 23:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d7eeecddb1f55501c78cfb094751779 SHA-1: 22f7b12c28e3002ebbe53441f949d7693d9905d6 SHA-256: b4ac42b811a47e6aadc3849efbbaeaadaaff5ceb35facb9bbfbe734f09266064
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, many of which are link farms on disposable hosting, suggests a phishing or scam campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be part of a multi-stage attack, potentially involving a password-protected archive to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=free+fortnite+accounts+ps4 PDF link annotation
    • https://nmg.lv/img/uploads/files/patesigebufidagasafisato.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/wulasesofolebunekum.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/bisebajovefune.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/woxilesajovokebaziz.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/76407552472.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/95930064120.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/dapekudomisagonilexamip.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/dajagegufifizedosetuze.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/fijiverumuguneluzavas.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/58700093172.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/12295194242.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210911160922.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3ac8fafa---kapusamunuzodokevel.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/75572812603.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/2329044302.pdfIn PDF document text
    • http://ebus.cn/up_file/file/37628343100.pdfIn PDF document text
    • https://khanikango.in/file/sutejoxomefodifomemeg.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/20994415557.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/16691163716.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/28521829970.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/78463934383.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 10584 bytes
SHA-256: 1335a103654d5fcefd63c46484bccd91ac95a9602b4082045bd13226b0c5e859
font_02_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 17044 bytes
SHA-256: 034d4097bb65da21340614ddb7a8602640d6d041fd5e5ac9dadf674817ab0b2a

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