Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74835fcf82c898c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-10 21:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07684f06724ab602f4ddb36cbfd4ac6a SHA-1: a045d55b20b43ce7fff9104df6684d9d7e2cd18e SHA-256: d74835fcf82c898c3237367e16a0ef188c77fa4ba62a64883a3ba934dddb3f71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sea-cruise.ru/ckfinder/userfiles/files/muwuruko.pdf In PDF document text
    • https://mysmartedu.com/uploadimages/files/15459252387.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/bubivikezojef.pdfIn PDF document text
    • http://capital96.com/userfiles/file/jumixunudebidetasasizeb.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/60065017285.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/mazigexetukalenunale.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/48609979144.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/pabaxugefarorupesimaru.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/denimufojovuso.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390913b7389---32157161164.pdfIn PDF document text
    • https://basisnomor.com/contents/files/10945118232.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/dijivujumivokozem.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/70372511754.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/teliwegilezimi.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/momowagisozepawunegemet.pdfIn PDF document text
    • http://mopron.ru/upload/files/gupuvuma.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/72727411236.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/42553462344.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/45357569829.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/pokefowetuxekizopi.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091017490711.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/38483655183.pdfIn PDF document text
    • http://elma1.ru/!upload/files/58873678557.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/328dec7e84d044ed82f95550b61534b0/27481272490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=suicide+squad+dual+audio+720p+downloadPDF 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_off0000c2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EB 11008 bytes
SHA-256: 689209e0f0242a5ef80e9365b3551137ee4de34eb3af351037a0f25a2236346a
font_01_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 18140 bytes
SHA-256: c353aba2ec22b725d6deb83562fb3d6b5a2b990a575447e9b7a70379f06c08e3
font_02_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1