Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c01fb7f69ef908…

MALICIOUS

PDF

106.6 KB Created: 2021-02-22 04:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5f763bf3d8b61b7562a4396eeb048021 SHA-1: 72deae19ffc3346510822c2b76c86e6e5a0ebcd6 SHA-256: f2c01fb7f69ef9087eb68bcf971a5b3cdc4509027fe6b2136713ee5deb238eae
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this PDF is designed to direct users to external sites, likely for malicious purposes such as downloading further malware or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://leonvi.ru/123?utm_term=what+does+rudder+mean+as+a+verb PDF link annotation
    • http://antonioita.fun/download_stickman_dismounting_mod_apk_revdlrd5tt.pdfIn PDF document text
    • http://unityfree.xyz/android_developer_settings_shortcut5sckz.pdfIn PDF document text
    • http://zoo-taxi.site/niramokevubekek4cep3.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/gjijYEy/ipl_chennai_super_kings_match_2014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_60160d7dab7cc.pdfIn PDF document text
    • https://cdn.sqhk.co/zaniridut/gyQLrgj/sozawano.pdfIn PDF document text
    • http://techanomic.com/class_12_biology_book_in_bengali6sw0s.pdfIn PDF document text
    • http://vamoktin.ru/569069115234mxpq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505102/normal_5ff804d964c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_601ba9446641b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448538/normal_602b78fe0ff46.pdfIn PDF document text
    • http://x-bionic.shop/gobilexesokixunajfr7wd.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxubefe/jRygc17/13185680191.pdfIn PDF document text
    • http://hookup682.site/16095218921k4h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_5fdac396bbcf5.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/jdhfjan/sakizudulogex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00016403.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16403 22604 bytes
SHA-256: 7be999f3317c12bfdd067cf693ee7fe8f7694b6760968da6f0376838eaf8796d
font_00_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 7592 bytes
SHA-256: 470f4c8a199b9f8a67c4a1e486bcfa28c5f22dfff36092b47b795ff0704fdf1e
font_01_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 5248 bytes
SHA-256: 7a11d2f71f9ddc1f43261ef68c68af6ec79b742eaab1c38a614965496884e206
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 8264 bytes
SHA-256: 0afad0d8463195312005fb9ae7925c2812c004599d05f7c5f1986316a6b66940
font_03_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 17272 bytes
SHA-256: d2af68bd378488ae55257721231d9c7f389b69301550a5579976966f606bd808
font_05_sfnt_off00018b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B7A 3808 bytes
SHA-256: 5deef0703b15516448cf34aa4fd754f69f2add9cded31a32c7afb8b9091aa6ff

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