Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9cc8cd02d8c489…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 00:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 244776e29f9401d10f7331ce77d08e40 SHA-1: 62005f18afa6eb06a34780534268ce6a516b9d31 SHA-256: 7f9cc8cd02d8c4891c3783a6b7d9f9b6a7f625ed4ef492aa36992e153aa63098
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a pattern of link farms on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=minecraft+pe+cartoon+cat+addon PDF link annotation
    • http://tucholainfo.pl/userfiles/file/94224482329.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/51949811865.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/zanisotizajipizawes.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/86469663881.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/86144822041.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/10363376523.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/69380985417.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/65866768587.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/nuvetunaleg.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/kujerajajuvaxati.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f4b10ed2eed1cdd4a0e34d68172a674/5999904299.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/37549423212.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/dopovirogux.pdfIn PDF document text
    • http://armanetti.com/images/21405617791.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/keradaxalenozivefet.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/talijowovisigowupowadoti.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dekimewulatesexu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/medabopiwakivaj.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161376532714ae---gilaxenagurebafunaxumo.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/gebomajabifolaved.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/26938579607.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/bejudege.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/fofilexabigamolanijakip.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/lifusokimatati.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_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 19748 bytes
SHA-256: 3a0618978e64b8bc9773eb9d925c0ce56db59ce304103351d02cb234f589477f
font_02_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 10392 bytes
SHA-256: acc481bf144dfd76aba31a2704972f1ac937d79a68eb8cacc64624f418046066