Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9bf54ca328995d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 16:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 92d1abfb6b448633b9c56523d663f18b SHA-1: 9dac166917e0631b05f545ca7c3b3a6161600279 SHA-256: ea9bf54ca328995d06bbaf0b49a52f79e6610848742432cfa773332d697ae2cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://allytemp.ru/uplcv?utm_term=principles+of+accounting+mcqs+with+answers+pdf PDF link annotation
    • http://desushibar.com/userfiles/file/99049857789.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/metidivosozotinavubiwijok.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/jeperile.pdfIn PDF document text
    • https://okazionche.com/files/69870154863.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/pimafuda.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/86968951421.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vokizeme.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/wakujajidurimakibuxomevul.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/82066296610.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/ripin.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139216fd5c55---jedanonejeturotixavekud.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/25362107028.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/38805042307.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/22610910587.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/doxitesadoxurem.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/47411198646.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/90030000183.pdfIn PDF document text
    • http://cy2hand.com/userfiles/3594200980.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/potuma.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/duzozalinisogodis.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/sedejojewuvud.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/bafiza.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/75324837845.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/35926267824.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/rejanirekono.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/dimamevapa.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_off0000b578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB578 11400 bytes
SHA-256: 091921c9fd8f14f7e7b2d065c081798edfb1561b48d1fae6be926af1bd622af5
font_01_sfnt_off0000cfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAA 16804 bytes
SHA-256: 5ebe48e90e6c6c0e42a008cf1141dd56fcc02fff5ec0ba844efa78b17fb6e90d
font_02_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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