Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3cc7b057f3b742…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 11:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5a4a02552f07f4a360d9c1e1740045b SHA-1: e5405bbcd96e3ce690705dfb55dc3b53acd06df0 SHA-256: cd3cc7b057f3b7424f6c0ff794b223db9613357be84148595bd66054094120f8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristics indicate it functions as a link farm and a QR code lure, instructing users to scan a QR code, which is a common phishing tactic. The presence of multiple external URIs suggests the document is designed to redirect users to potentially malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=how+to+scan+qr+code+in+android+play+store PDF link annotation
    • https://poulinstrapscan.com/userfiles/file/47987572548.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7074f7e82449a3818219300aee52b5a2/79801866691.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/jazujirevixudokekitumof.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/matakukir.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/pifona.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/fukulezatowufi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/41308356464.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/rutakomadugadiwos.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/58064486086.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/14761497230.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/32448683303.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///97317522752.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/gevesepazuwu.pdfIn PDF document text
    • http://netflor.pl/upload/File/31852038640.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/fexikegosisikenakojitirul.pdfIn PDF document text
    • https://tigapilar.com/upload/files/zibiwozoraxujalenos.pdfIn PDF document text
    • http://cudicio.it/images/file/56292063532.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/logomeg.pdfIn PDF document text
    • http://mariancozma.com/_user/file/12323787398.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/winubarutubogexak.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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 10844 bytes
SHA-256: debb2b9aabf60a8e3b9a2ada315644528d23fd84c5f2c477d0baf5d607066eaf
font_01_sfnt_off0000e6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 17792 bytes
SHA-256: 113708541636be777889edc00c7ac15a56bccad6c5f9b936d2355fbc1a8fa7d1
font_02_sfnt_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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