Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d025c3c610dbb1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 01:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b63c8784e992ff30b7c6e450a304c147 SHA-1: c5b013a6717b865700e885049724f7335b7e7045 SHA-256: 50d025c3c610dbb1f537c51c245833726ec1f927bbbe55a5620d4ada384a3978
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. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, 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 0.9978

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://infrive.ru/uplcv?utm_term=geometry+dash+2.2+unlocked+pc PDF link annotation
    • http://sarica.com.tr/ckfinder/userfiles/files/49691461596.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/wigiguwumavoroveponoviwi.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/jajuso.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/rikizeluzawut.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fbc0fa945aebe547c8a1e7a31322b47d/xiwulikexoxukakulirekatam.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/koxorufajinuzisorigep.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/18495557947.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/fuguresekajum.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/63268177064.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/25107477165.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/demededatewobofina.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/80376160083.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/duzoxewuzugodewewe.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/bisuxofajujovuli.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/vavarolegazowasewolik.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210917132101901.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/8914045683.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/93030124992.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/guwijezaxoxudixeveb.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/sinirawimalapubezur.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/xozukagujomumigowixesexo.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/37584516683.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/pubemo.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_off0000b0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CA 15160 bytes
SHA-256: 10811124526fb5ca51249712cac620ca60e6d04e59a30c94da59cbcb60bf0a1d
font_01_sfnt_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 11216 bytes
SHA-256: 065bd447cafe122beda2cdd177a2a2b7e35d1a0671c5312d1aa444691927ce44
font_02_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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