Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d57743fcd9d9df…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 22:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e46c37fdb4e22e184d7ef9dccba106c7 SHA-1: 0b0d72f51637c1105d3f0ee2b45b9b23b1556ccb SHA-256: 95d57743fcd9d9df4abdb124542a14e60d3943f91dc86cc945f55b485d6bbaaf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it is likely used as a lure to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to create a link farm on disposable hosting, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=hard+reset+code PDF link annotation
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/21107163608.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614523755fba3---zodipemibigol.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/51835687930.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/18324433603.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/71696541730.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5fc70cc38dd5e056c92a0d914f8ac272/sileji.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/liwitatajokewamo.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/40302926851.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/sonojipedeziwux.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/rimijedarapejof.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/sixokuju.pdfIn PDF document text
    • http://novichiha.ru/pic/file/robuxuxudurowej.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/pelofurufadivasonumiput.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/30447013323.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/27890638043.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/42178462933.pdfIn PDF document text
    • https://hirurgija.me/files/nijosirerenegosa.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/31399941898.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/negetegopolupozopogij.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/68312946313.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/lajaxabosev.pdfIn PDF document text
    • https://gangnampools.com/contents/files/1347094533.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/xiziviwuje.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/66409724724.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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 17908 bytes
SHA-256: 4af49912cbe47ba934da664f9ddecf9a001064f091b77950f5ec085ad044ba39
font_01_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 10112 bytes
SHA-256: 4d752c960c6d5d7edd88ab5e5fc34d7fdcff523c179c018c630acbede8f26b9d

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