Malicious PDF — malware analysis report

Static analysis result for SHA-256 11dcc48d091f7f1e…

MALICIOUS

PDF

73.0 KB Created: 2021-03-31 11:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a4315fef484211c86ba770bf59f58066 SHA-1: 59037be8c8ec84fc6fe3d2a34324dcb9e1b009b8 SHA-256: 11dcc48d091f7f1ed85c16601bc5181993e9af8bc6b440d2f304bff0ca7ba512
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://fokemale.ru/wix?keyword=taurus+pt111+owners+manual PDF link annotation
    • http://afterdealer.pro/crowe_horwath_reportvcnjh.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/iehghjr/67976346564.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/2MTNkwN/nedawinaf.pdfIn PDF document text
    • https://cdn.sqhk.co/kofatuziwu/40Oicgg/hearts_of_iron.pdfIn PDF document text
    • https://cdn.sqhk.co/doxelatofon/vLhfjg5/mekivamesisavibaj.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/usps_first_class_mail_international_tracking_indiagfryz.pdfIn PDF document text
    • http://neuroncraft.online/quimica_inorganica_catherine_housecroft_portuguesh1uwm.pdfIn PDF document text
    • http://iranianvc.com/96419350886uoc2s.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/HibdhdU/cover_orange_walkthrough_1-_30.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/gihaUgd/make_photo_slideshow_with_music_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/Kc76Nij/natural_african_hairstyles_short_hair.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_5240789bbf95471a854c3c633546b4bf.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_89372a82acd5487b8898c214bbb06e1a.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_cea652520ef34fceb2584fce3af14fd3.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_4d6dc2fa67ca4dbdbdc0a7a679527266.pdf?index=trueIn PDF document text
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_e57690f64d004a548e2572e033cb8e4e.pdf?index=trueIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_4c067dd029394932a192bc17f1061d32.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_0ea10f3807ee4f9c835f4cb18b6e7cab.pdf?index=trueIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_671ffd865fba42cfb67f20eecb984f1f.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_0ad85a34cb14480da6fe9306695a37d0.pdf?index=trueIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_f2245411e85540e8af7cfcf0b8210a5a.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_447c448a89a4460ab658bf6366c98828.pdf?index=trueIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_29373695a1d84ac380da2e602644d18b.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_2684053f318146e5826b6d5c79ed78d0.pdf?index=trueIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_c0ac847b620340189a39a6b580f7f6b6.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 5060 bytes
SHA-256: f9b80570014d6ef45e4ccab609a8d41795363756ac18111a60424dba453f8979
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 11624 bytes
SHA-256: 0dd62e9093e56fdba2a3c3c75d58ee98525ffbf439e366097754d940fe1af7e0