Malicious PDF — malware analysis report

Static analysis result for SHA-256 1173d90a19df1a53…

MALICIOUS

PDF

90.5 KB Created: 2021-09-09 17:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23d563149309c0f2eff691381952a89e SHA-1: af8df061d7522298044e0f4a21d3100dda913fad SHA-256: 1173d90a19df1a535e33bf45de97dee91413bf1ae2706f57013974a06e1c975e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://krisoc.ru/uplcv?utm_term=drive+movie+watch+online+free PDF link annotation
    • http://utcsp2.rustyramone.com/uploads/files/5502128570.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/58400508498.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xisagisejuv.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/57151654767.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/42613063314.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/jotibilatewexob.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/48864647705.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/renajakuxasuriwek.pdfIn PDF document text
    • http://maulich.vn/attachment/files/pogem.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/neneto.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/tewuxigesowabewebebu.pdfIn PDF document text
    • http://e-sportis.com/images/upload/tagorelamuxegufujur.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/bitukiw.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/12739400681.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/10009331598.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/gawivomafomejalaxatipujum.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/81129067186.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/86285706138.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/18500141552.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135303a466ba---zevofavorojebiferaxujab.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210904_505167CB0671DD26.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/50564168586.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/85381619979.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/15969446686.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/80291828044.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/55967753060.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/mogitogomejuvijaropil.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_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 17840 bytes
SHA-256: ec4751fab518471ac90f4c49e5d42e9daa065134c0f0448c9e7ceefc64d22b68
font_01_sfnt_off00012bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 10584 bytes
SHA-256: 08be99f55d1b81ac2cd22cc8ee64c64b34053221b38c4d2eab3d511cff4f4b92
font_02_sfnt_off000143cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1