Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a64554a9ba2851…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 22:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f5eebbcd9038a481390db25fb36c75d SHA-1: b7b8e5006b0477500fce5c0a647ba47c68155742 SHA-256: f8a64554a9ba2851f02c65ebb07bdb2e7f00d27836434624084271dc5ff234a9
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 0.9973

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=lively+wallpaper+2+monitors PDF link annotation
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/tisiloki.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/wesumalowixenupefarejexu.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/ritofejibidolo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd1136527---narobataz.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/9142290570.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/89135320371.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/47540306196.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/wozujigipolefaretu.pdfIn PDF document text
    • https://izr.fr/files/8427818310.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/87183766485.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/tugesinebotol.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132d40536653---60749837130.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/jomanabufi.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/ranatumineremamon.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/90610707806.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/noxel.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/tibosototupakefum.pdfIn PDF document text
    • http://zuche0551.com/upload/file/77029812241.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/pasovukabufodunubumiditul.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/tevejugowozidoregojiraz.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/1022209113.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/bawowejadoratomewaf.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/vijafovenuz.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/disavo.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_off0000c32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 16684 bytes
SHA-256: 6760039c142f77aeb9dacab206c90b80e99201f2b1193123c20697c818c498ec
font_02_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 10756 bytes
SHA-256: ab72ba398f95df124dd64204ff13ffa9efa0b638866e78e058d3c5d7e57a3997