Malicious PDF — malware analysis report

Static analysis result for SHA-256 8473cae6dde69611…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 10:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dd36559ab0ff00e4066b6b3d402df445 SHA-1: ba8efa22215b7ef5d50a0ebb23501b8e7c77a400 SHA-256: 8473cae6dde6961109697196a2e1089f35e8764165e45354eafba900e484e8fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=transfer+photos+from+android+to+chromebook PDF link annotation
    • https://catwalkdogcome.com/editor_upload_image/file/vavisadatitovuluzizipa.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/tekafemenufovamuposedub.pdfIn PDF document text
    • http://muszempilla.com/files/file/mozawevapewinapiwak.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/87552315929.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210901_BED5D600D26CB3DF.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/efosbl270cjc1l55ahrfpcpjg2/noguvidija.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/fagolafusesede.pdfIn PDF document text
    • http://zeci.nl/im/image/guvopejiniseral.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/5751645511.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/sitidalubi.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/2385703286.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/zegatigufiwaxajelitam.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/9287542419.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/20446962973.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/nunatipowisibadin.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kidodedudil.pdfIn PDF document text
    • http://rimi.sk/userfiles/file/dapetegabirasivutu.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///39779465424.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/50255527494.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/28453888897.pdfIn PDF document text
    • https://istanajp.net/contents/files/16663841861.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109032155056405.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/sezazukuwivixe.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/19369791092.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/vezewedepu.pdfIn PDF document text
    • http://binhvi.com/upload/files/4609512786.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_off0000c083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC083 11032 bytes
SHA-256: db15d30d4fe3d1a9c47c56e8437a1a32beed40a9a7de55ef55da752f6aa2866e
font_01_sfnt_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 16440 bytes
SHA-256: 999f80548e3031e0e83dc0ce18380212bbe75d3cfd50a6486cacc9993ac0ec9f
font_02_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1