Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f23b0ed7c680c83…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 06:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: a431bb3f80955cf89f7249038bf94c63 SHA-1: 7ba84be14e86b8b99ca924bf25b9f8105e1c06bc SHA-256: 4f23b0ed7c680c83ddda7cf9e81c322820efc1614233b80cbc6631d055b3a264
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pixomot.ru/uplcv?utm_term=itunes+music+download+free+for+mp3 PDF link annotation
    • http://gyermekhaz.hu/Content/site_images/files/30264294226.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/dazojejiruwup.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/463535717.pdfIn PDF document text
    • http://bndweb.nl/upload/files/30576605144.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/xekifilupavorofuxif.pdfIn PDF document text
    • https://empresa-venta.hr/files/33447116346.pdfIn PDF document text
    • http://full814.com/upload/files/59147905525.pdfIn PDF document text
    • http://boldogelet.hu/media/mikivagirusomowop.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/61839963910.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/vikozarogurugejejakub.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/tufusofozixa.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tuwumut.pdfIn PDF document text
    • https://tsegypt.com/file/21971574731.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/53327899963.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/sunedexedugokit.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/zitalupilimetidore.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/gitolukuvet.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/3581415112.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/gixitim.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/rojuwubabedokuzenof.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/57123002042.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/71611111067.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/604424359.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/totalaxagipotolo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/inklaa5tpu11nj2nolvucr9ccn/21405103496.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_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 17748 bytes
SHA-256: 70bea6572cfc6ad00126dae9cd7286a7839929d9715e4ee56ca6d2668f499863
font_01_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 11092 bytes
SHA-256: 74cd9d6f80c30d93939881ecd1f7ce2f82fa08a6d0bd57c66a174e92035658d4