Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a3fdb7a50879b8…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 12:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5badf3a4270f4be6c38ab1f80eff3098 SHA-1: 1fc382ef85293fa1c3640491876e1016401a898e SHA-256: 53a3fdb7a50879b80350a65e03ae4db38c4b78d1631b6fb4910a6cdd6749cc64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified numerous external URIs and a link farm structure, suggesting the document's purpose is to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution lure, likely initiated via spearphishing.

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://oniceh.ru/uplcv?utm_term=gmail+is+crashing PDF link annotation
    • http://hondasushi.com/uploads/files/79412644850.pdfIn PDF document text
    • http://cycling-software.com/files/file/baxegufogevoxojuxawi.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/subilo.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/mipumojonewas.pdfIn PDF document text
    • http://salwex.hu/file/52792793464.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/56544773308.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/32943824081.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/tipibapipoludi.pdfIn PDF document text
    • http://home-plast.ru/foto/files/wobozejevebusi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lewezewo.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/50528411199.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fowikurosanowotiguwa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe9c0d62c---27022910014.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/41307047853.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/19073399378.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/94369095435.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/60915452450.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/ruvulawofa.pdfIn PDF document text
    • http://tano-cable.com/d/files/nubawopejodek.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631532148.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/vunadapotufa.pdfIn PDF document text
    • http://tdbm.vn/upload/files/surefefuk.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/popijanufavewadifug.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_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 18604 bytes
SHA-256: aaf4293cd23dd242c452376caf0bb035d0137d1e4961a4ca31b5462f17e43bec
font_02_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 10364 bytes
SHA-256: 5e3046724f2e277971a1f5254c78a28ab88a38c549c5acdd374ad22d05a84ea4

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