Malicious PDF — malware analysis report

Static analysis result for SHA-256 21da0f70997c847e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 21:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9bb13b6ee7def4380368d1609455826 SHA-1: 798a0b53b5928782f5f2a1e1e5f536c896cc8435 SHA-256: 21da0f70997c847ee1290520b11e35f204b6729a39bea0c5213e138d84603b5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=android+market+api+example PDF link annotation
    • http://telefoonindex.nl/images/uploads/86590529013.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/xewed.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/46742431016.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/legegixegujid.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909194954.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/baniro.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/67852516917.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/mizefajatimorexedelonuzo.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/19487399693.pdfIn PDF document text
    • http://ge-mak.com/files/minizixi.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/14064438429.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/30406114635.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/sebibutagu.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/46333081693.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/13/file/55956625929.pdfIn PDF document text
    • http://vanhacollection.com/images/files/94876652608.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109060305326942.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/17763861166.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/xafuzopoxuvejebasetevok.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/65372251545.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/56066469782.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/4001036465.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/19524557051.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c61e314a0---675042049.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_off0000b3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 18532 bytes
SHA-256: 8495d5813c6d3164b98b615c981d2e0ae02a69036d4d8fd4bdf72f017180d320
font_01_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 10560 bytes
SHA-256: c947f7cf038ff77c42bfd9f896a744f76621018c1d36569386775c96ed7b732c
font_02_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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