Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68d57c1bb54ce1a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-22 21:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11ba03a8d39affd1aef5943413743726 SHA-1: 4fc2d040fcbe8c96e9acfac267704e80f715070e SHA-256: c68d57c1bb54ce1a6a613bd1b60a24613e730ea8738733d82a201ea8472f4c5b
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ghinelliarchitettura.it/userfiles/files/12849201528.pdf In PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/tirusagejedopifek.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/83599684061.pdfIn PDF document text
    • http://gdgom.com/upload/file/210907232453510935d685niduxv5g.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/7299776916.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/feditonusux.pdfIn PDF document text
    • http://weldingplaza.com/files/file/napabejavid.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/bokixofoxidaketudebuxipu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8cb8o5o8crkkqafii7evp76ljc/sebamagedema.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/sezuxupitotisim.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/wuzasuwenivoleberirenur.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/11563491453.pdfIn PDF document text
    • http://bndweb.nl/upload/files/xisub.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/juvalofukutupugugidun.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///zonulugosapoz.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/famozobuzakumebikezek.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/kumiwegeripesikumidu.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/takow.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/womuxefuj.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/nizodefinujaxig.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/rugomokugorofakar.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bazuziri.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/86396342182.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161314593be43a---71024969262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=record+suara+di+hpPDF 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_off0000d1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 17948 bytes
SHA-256: 324de77844009074406bab54b580e74d77eea06c21f132e76a7e10a54c874f81
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 10508 bytes
SHA-256: 24cab6c01fad57f2ed037230040e178fb3d58257d09056dcd84cf047473d1260
font_02_sfnt_off00011813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1