Malicious PDF — malware analysis report

Static analysis result for SHA-256 842e41916a6c70f8…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 14:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 826347bee9a9608130b67d35bd2fbc12 SHA-1: 871a70d79e1ab876e97f9866a85787faf680e9d1 SHA-256: 842e41916a6c70f82967b7791340700dac67e3675c2d7db107372e9332bd6e95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a link farm for malicious purposes, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=murder+mystery+2+codes+2020 PDF link annotation
    • https://cowichanmusicfestival.com/userfiles/file/24024144487.pdfIn PDF document text
    • https://yifff.se/userfiles/file/pekoguvutefugoxivizexaju.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/25012684755.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/65170936895.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/54220835416.pdfIn PDF document text
    • http://vuason.vn/upload/files/60267761080.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614005dc067c1---17747409528.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/rubejul.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/25462736540.pdfIn PDF document text
    • http://carszana.com/image/upload/File/37351104268.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/difibuluxowarimidatojov.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/takivewobokimafuxepepex.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/guvixafuwovi.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/bolajafafenufekorazukowef.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/wazivegekezow.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/kidadurazejex.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/75714692407.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/riwekosom.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/ruleduja.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f86fc59ec---48442840857.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/tutesopikopakorawoxefu.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/sufajebefuluti.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/48258893484.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/75529834628.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_off0000b512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD29 10576 bytes
SHA-256: 2c27cdb0e79b4a8271ef237f8f8f70ac54b2ac64d5d25199a8c966f4c985f02e
font_02_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 15720 bytes
SHA-256: fbcf1d3b163791676db59656a04952a43ecd1e4f0587b62b443d3d6b801a52b7

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