Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0d038ee4b86d72…

MALICIOUS

PDF

82.5 KB Created: 2021-04-02 08:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 974ef31363f1df66d74d07515947439a SHA-1: a3dec72105319fb5a7ac70ecaf1cfde955d941ea SHA-256: cc0d038ee4b86d72ae8741875bcbd04c7472f57c4e824ec1ed5e727812586a56
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://mezovuduw.ru/wix?keyword=tape+diagram+6th+grade+math+worksheet PDF link annotation
    • https://sowupetu.weebly.com/uploads/1/3/0/7/130739285/34b02dd9a6603.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/hjgPhhq/photo_to_video_maker_best_app.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/036c5e3c5162.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvuwoki/shaiejf/my_cloud_library_app_is_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/o7jboib/85528695071.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/ijghhcs/rocket_launcher_ark_gfi.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/0fe726a.pdfIn PDF document text
    • https://larebefol.weebly.com/uploads/1/3/4/6/134691273/kemalovogemoxut_rujaloludufo.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/bxohijg/2122420930.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_62e9cf8629e64b30ad3f87da48fc2de1.pdf?index=trueIn PDF document text
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_d820f859788a497a817b8a573c5b9e55.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_ad1834ef23994f15b6901335bff4167b.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_6bc67af2ab654153aa433a8735452d81.pdf?index=trueIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_8ed624c8cb424d1dbf188742374fff42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/425229809.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_67ca2096407144aab28bfda2a9e84fbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xirixepo/togunosanowokofa.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_6562a1a7d47043e5b167cda367741329.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
    • 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_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 5600 bytes
SHA-256: 484cd767ed0581016e240dbedc0194d7a26c73f4f96754baf0e5542b0088093f
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 13112 bytes
SHA-256: 078612a6e2e645bb72f6bbfddbe036e26468ccf93d3ce3b70ddcdab7011b6877
font_02_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 16084 bytes
SHA-256: 4a5af54a66bad704ac8578753c3885b6fe72908680fd525320c8c407072591aa