Malicious PDF — malware analysis report

Static analysis result for SHA-256 394b8ba5cafe0313…

MALICIOUS

PDF

91.2 KB Created: 2021-09-11 03:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79dd7a08aef1541a8cf2529c1f66c31e SHA-1: d0af012de3d907119e7b4b8f91de6d6f5c5d4669 SHA-256: 394b8ba5cafe0313b4b329d68ddf6db7cad1e213eda4d473f3a22987964c6b08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The presence of many links suggests an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kindergartenhelden.at/upload/file/pusosewe.pdf In PDF document text
    • http://ipea.kr/userData/board/file/laroroluju.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090704184173499.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/vasowugukidumugobexewu.pdfIn PDF document text
    • http://vhktn.at/images/content/files/80235058728.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210906165324.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/fukivenerinamitanuraxob.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/bazozatudirure.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/31791004205.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/bisawemadofewi.pdfIn PDF document text
    • https://esz.jp/img/editor/files/zaxumelomutanibaje.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/77479631855.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ed11df2a7---23616540483.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/35911951117.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/kafetivusofasesasulaf.pdfIn PDF document text
    • http://poorclarescork.ie/images/difokujupawujojaja.pdfIn PDF document text
    • https://hsse.cl/files/kibopelalevutasarupil.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/lafajesalidigutuwugaxu.pdfIn PDF document text
    • https://coevent.ru/upload/files/jejuzedutipige.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/duzilemedopogefalemewowe.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/53967428876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=snap+vpn+2021+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013212.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13212 16392 bytes
SHA-256: 6ba4eb6c143182b795c615730ce1dd987b4a49f4d390e46c5efb3455399f9362
font_00_sfnt_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 22216 bytes
SHA-256: b2fb23a6782dbaa54a2acb852ae0d8c38b28910122d249ae6e56a3c8acc4abde
font_01_sfnt_off00011a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000148a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A7 10016 bytes
SHA-256: d321936b621221453509371fbd08267711597272ed5ecc5eff04608983c73f57

Open this report in the interactive analyzer, or submit your own file for analysis.