Malicious PDF — malware analysis report

Static analysis result for SHA-256 e090613867dc414d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 08:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdac5f575403b663ae9ae70c8d0b1312 SHA-1: af2d1b91d459d94f92047618b71e89ceda1402ab SHA-256: e090613867dc414d46d71edc1feda91c89f9563920bcf124540f09ff067b1186
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct the user to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://novafish.it/userfiles/files/jexum.pdf In PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/zilitam.pdfIn PDF document text
    • https://naves.cz/res/file/67032836050.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/pararuwelosowofasod.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/64684489368.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/digilolovadiburo.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/goziziwid.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/76139915864.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/bazut.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/46111533213.pdfIn PDF document text
    • https://rosycaffe.com/file/nipafefemomedune.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/bumodabodagemonag.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/38425310665.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/66139449177.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/12/pojezad.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/welibevitazufanulametari.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/6134527176.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/85756335638.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/45713859307.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109110404223506.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fd67ec7c4698c0ed7fbf8de0e960e032/woxasunovapexow.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/26510944906.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf0c9e9c7---totobelewu.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/34600342519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+uninstall+any+app+on+androidPDF 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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 10544 bytes
SHA-256: 477dc255ca5c5ce1dde80a7549cd68ce6e584ccfdd4945fc283adea63a6a1192
font_02_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 17280 bytes
SHA-256: 3513fbf866a7aaf5c07d5ca0abe1d175a2f2a9411791067af5eccbf25f619e55

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