Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4e36c192815a5f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 11:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df0b3f785598e42a15d8630fd15bbaad SHA-1: 800ee6ec41adb227b221ee4586c0cf3bccbe8b58 SHA-256: 3b4e36c192815a5f2e17c06a97fb7500821e2ae563055758b23a8c72bf4821dd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains multiple embedded URIs, one of which points to a raw IP address, indicating an attempt to direct users to a potentially malicious host. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm structure, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://italvaping.com/file/domubozosoxefinoguga.pdf In PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/56363676933.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/kazapuxalo.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/9300038414.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/kamepirudorefalusol.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/10554309738.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/tibuvitid.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/zijinozojomiwepaxinotex.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/77036551035.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/78178072822.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/27338034602.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/66401289039.pdfIn PDF document text
    • http://getdol.com/page_data/file/45430695707.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/nipamewazumerisegasoj.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139abb877903---vorurixurese.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/gazoreru.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161400d6e35c8d---zukesobironilibobilewos.pdfPDF link annotation
    • https://factorysales.com/userfiles/files/16340391467.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/vazur.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/tukupu.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/73219248358.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908124718804.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/jevanapudibusu.pdfIn PDF document text
    • http://195exim.com/datas/files/66399405519.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/jadorarakasimeriri.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/mirijodorazutupiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=6th+standard+social+science+book+in+kannada+pdfPDF link annotation
    • 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 17328 bytes
SHA-256: f8bfeb4698e34b30c629d0164c6f001191ce3d600b5ee95f284593337a4bb96a
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 11020 bytes
SHA-256: f18014350ff7b7462fbd499e120d9c4f0c85d63e16613e5ea8b30fbe89b6bb13