Malicious PDF — malware analysis report

Static analysis result for SHA-256 d847e459536ebfff…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 20:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 144eb34a2601768590b8885521e7b9dc SHA-1: 591fa3dd98b4e4d6324932f4c7c19dbd35154798 SHA-256: d847e459536ebfff63f55aede23ef58b1ca727563ccece1a0b89ae99549ee51d
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including a link farm heuristic, suggests an attempt to manipulate search results or host malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=game+multiplayer+survival+android PDF link annotation
    • http://budoprojekt.eu/obrazy/file/72887181616.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/49074072196.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/refasuwag.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/jogufakedu.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/rologatiwafefowesomu.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/tenamulizekofinuzafasomi.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/55339966973.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/59845236090.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020051317396.pdfIn PDF document text
    • https://clickbox.ro/images/file/75974617435.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/65632307951.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134514a68a13---67502383439.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/91917482761.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/51852489411.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/befuzovekoberalob.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/90964098432.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/20583502851.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/gokavejametizote.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/suvuto.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090506153573499.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/ponoluvogivoz.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/19111539815.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/gekekivamixuzezi.pdfIn PDF document text
    • https://orrizon.ru/images/file/gidezokawesowawa.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/viganejeva.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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 17164 bytes
SHA-256: f87cc0f0c6b558a67db371b10dfeacbc1f99bb12e7d0f45fb6a46d93a950ad1c
font_01_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 10872 bytes
SHA-256: 2e9ecf3f7def7710c8caf19814683cab2455db0dd1b31d688bd7d2bb78eff49f
font_02_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1