Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3507547803d87e4…

MALICIOUS

PDF

77.2 KB Created: 2021-09-25 18:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72bdc9a7e479ff30187a3d8f7cde90f5 SHA-1: f1a893c3f22747744aa1e5c3ebdd8fe4e1ea2b73 SHA-256: c3507547803d87e43f3f4b8302ca409307dc0e12e0fd1ddab0c1ae37a775fe71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://goodmix-psc.com/userfiles/files/jotifarugepuzedivume.pdf In PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/56437534941.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/miwotevozewemud.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6f4926e5e37e21c93cfe50f90d848fd4/witej.pdfIn PDF document text
    • http://air-con.ru/upload/files/87470244076.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/jerigilamegibogewe.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebc6387c79---48271569985.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/99148240478.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/93203816276.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/65182368104.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/69916895458.pdfIn PDF document text
    • http://12shio5.com/contents/files/nobuzuduzeverip.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/58934567873.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/49323462130.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/84249800493.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/21778155020.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/9721311130.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/4289933620.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/24710219921.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/tevubunukuvepob.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/mederofisipapudevisezi.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tapinobobonabox.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/fusunefobujaserojavaxo.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/80987432912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=divergent+streaming+movie+vfPDF link annotation
    • 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_off0000c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC166 20420 bytes
SHA-256: 19256ddbafb20822d306bee85829be009459e34cf8d1b59546cd5999e961972b
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10576 bytes
SHA-256: d232bf2a77d2314f644f7b180c7193987b84b4e13b8a19d8d20bf62a082a5dfb
font_02_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1