Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bd40fa0988e6c8…

MALICIOUS

PDF

72.9 KB Created: 2021-09-20 01:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef4980160e98c80ab63dbbccc5cc3604 SHA-1: 72ea46fd78467d22e8266ab50b54658274acdcf7 SHA-256: 77bd40fa0988e6c833c0b4efd40fe38e2abb3f0dc5e8906c4ba8d34990b98caf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or redirecting users to malicious content. While no scripts were explicitly extracted, the presence of multiple external URIs and the nature of the link farm heuristic point towards an attack pattern focused on driving traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=sally+morgan+physics PDF link annotation
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/77497399919.pdfIn PDF document text
    • http://labsshop.com/d/files/29939759308.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/netup.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/petexisewenubejidaxirijuk.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/daporivib.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/favikopunu.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/14737303891.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/52941548244.pdfIn PDF document text
    • http://cmtsport.com/pliki/98072276075.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/58279526316.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/840848e4956be02d3e7b63f33c20f3a0/foribug.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0a0cbe734---bizag.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/rusasazaxil.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/xevisamemexabo.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090522285670693.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/70399810145.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/mosojum.pdfIn PDF document text
    • https://33mobility.net/uploads/files/33711322265.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/23536474120.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/safenezepititobo.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210904130459.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/87435198263.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_off0000b89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AE 17300 bytes
SHA-256: c18f3b055eb6be939320c8505e5b909d3a026dbcb172bbfd2dffc5af9c0f9c1c
font_02_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 10780 bytes
SHA-256: 7ee1601a671489459de37444e55cb426ef13bdefc1c9fb466a8c6ab0feb43bb0

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