Malicious PDF — malware analysis report

Static analysis result for SHA-256 2616da67d39f38b0…

MALICIOUS

PDF

68.3 KB Created: 2021-09-16 10:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86d21ec4d16b7bf2ca0693ec49119c81 SHA-1: 1fee4b93ac36b7168d0ad0a77d5002d0794c86ad SHA-256: 2616da67d39f38b012c1b312aa2f94fd2515b3cc9dafa26f7ca6af6e58b07336
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, containing numerous embedded URLs pointing to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=phone+booster+pro+2021+apk PDF link annotation
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161316d128a1ef---nifafezo.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/39153706220.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/50108562256.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38956753341.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/kubelexabimib.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/80233663881.pdfIn PDF document text
    • https://sim2007.com/files/54317098204.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/67673087669.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/35176761150.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/72796534307.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/78247111562.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/mibutezanesi.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/23557140109.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/5040858428.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/26869921058.pdfIn PDF document text
    • https://phnews.ro/files/file/99188409811.pdfIn PDF document text
    • https://ms01bet.com/contents/files/bobus.pdfIn PDF document text
    • http://aven.su/userfiles/file/fokejokizutagikuruf.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/32792067494.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/kasakonasiba.pdfIn PDF document text
    • https://maria-galland.ru/files/file/wewepeje.pdfIn PDF document text
    • https://cardolf.ro/files/xudimeralep.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/87791326133.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/rafifejilebirukilowiri.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/52neaqi6p172rr5lubm3g1mfqf/20689571857.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_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 10736 bytes
SHA-256: 3c291ff7f272495f4b7e3a3bb385d0b474ca668c781db009059262b6631df452
font_01_sfnt_off0000c84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 14444 bytes
SHA-256: dc0b79584ed4859a434c4ba5c90c8cd5eda5a8c5c4bedafe20112424069b8abb
font_02_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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