Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6e1ad3f494357b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-21 01:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 383f78b811356664068cd7d8e2cf59e4 SHA-1: db636e09da51c3dca928ce79c122de4f7362a6b4 SHA-256: db6e1ad3f494357b657c1da0fcc37c1d177b805add5864830c4ed5feaa847999
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=marvel+contest+of+champions+cheats+android PDF link annotation
    • http://svadbavmoskve.com/content/xuploadimages/file/supepikiluxivipobon.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/63376989648.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/59886423927.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140263613338---mubevasugujevimotuwu.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/wisitewiki.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210906105801.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/88043454338.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/pokilutu.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/52508521531.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-9/20210909141149511231.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/jexekudo.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/nilegamuxitupasesu.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/bawirixuwib.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/67939223569.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/faradepigudizalanen.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/zuderuvesesidipab.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/51567886695.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/gerasido.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/faxel.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/26247861244.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/88752473830.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210907_F2FBA5447A02ADA5.pdfIn PDF document text
    • http://envigest.cz/upload/file/gedosibakoxop.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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 18232 bytes
SHA-256: 74f10e01114133751d8b24ab13c3f064b9f2756d2bbf0143fe73769529c8a1fd
font_02_sfnt_off000130e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 10944 bytes
SHA-256: dfbe78b2072e7c875e49f10ded25e8535e06db5b5e6f71d4050b5f69fd639475

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