Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7af49f29e7109a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 13:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 643e2e4abd6cf8d72103a11039b3da55 SHA-1: 5c6740ae76b54f8cd55d4a9b1794be135350f980 SHA-256: ae7af49f29e7109ab7dffd9d2ad79478786d8c2c87c1650a5bcd57058688af75
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using many distinct, low-reputation hosts, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=adblock+plus+chrome+tablet PDF link annotation
    • http://capitaloffice.pl/fotki/file/kuzevenukilukipunofivire.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mekepugifuroxetir.pdfIn PDF document text
    • http://seamacros.com/upload/file/voropup.pdfIn PDF document text
    • http://lovesenergy.com/file/xoxebulep.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/xagegakejad.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/491281637.pdfIn PDF document text
    • http://olympusflights.com/files/files/38731931509.pdfIn PDF document text
    • https://0900107678.com/upload/file/dopafoxe.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/resepowipijagunirasesu.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/10758406903.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/94418609602.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/65880586952.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/93597530255.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/37094631181.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/60551486744.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/34203436497.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/60108428715.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/25344827646.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210913041707336002zcue3lff86va.pdfIn PDF document text
    • https://davnosti.ru/upload/93477160772.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/letapasugol.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/44777706212.pdfIn PDF document text
    • http://maulich.vn/attachment/files/11148949602.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_off0000bbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAC 16420 bytes
SHA-256: 4836a53ee5b81d0f609ff0f732a860901679dd249af5694c3fd8221bd6364c3e
font_01_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 10896 bytes
SHA-256: 02d416d0c4e2b5244a126f18fd4d647cf59a846a3f1a5f4b6b7963adfd47c6f4

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