Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df79be0b1fa1ca8…

MALICIOUS

PDF

94.3 KB Created: 2021-10-04 13:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4a22dc690e7ef6c42834742fb0dd5970 SHA-1: 5d0138fe37bb279952bf62a27589b28e2a253d73 SHA-256: 2df79be0b1fa1ca8ff5a63684c76bcf4dcc8cf74e97a7b509d26538e90e3b0b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to disposable hosts, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/25085030406.pdf In PDF document text
    • http://parikshitconstruction.com/uploads/pokawimakabinesupeta.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/58448465616.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/gorejoputabiwuneziwu.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/53963472036.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/gijofasasoviximiw.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/17458668961.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/jamivakokupokekutul.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b2b1ba80e---41314095578.pdfIn PDF document text
    • https://dafelia.com/files/vufilikatasibetug.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/sufitavevitedisiwigexadi.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/tiriwusilefu.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/zudajogujeworur.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/39160557130.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/pabisokebomadazege.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/levazolojufunu.pdfIn PDF document text
    • https://miminku3.com/contents/files/50254492363.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/fusivojovola.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/69995582909.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/niwugadelobe.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/godowivexajazuxetaxerar.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/43132a9b3d3dd010f73a2524f51322b7/kofadenovosawemasema.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/37148516288.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///70779835855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=interview+questions+and+example+answersPDF 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_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 18148 bytes
SHA-256: 744e3e23d53e297311556e3cf2a4ff13532310b8060bc2302d4a13540d7b8285
font_01_sfnt_off000139a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BF 11004 bytes
SHA-256: cc0965820ef1119fa89e200e5da54fd58262a971acd1c3e53e30c714848ee5b5