Malicious PDF — malware analysis report

Static analysis result for SHA-256 67de2c69c6635679…

MALICIOUS

PDF

92.2 KB Created: 2021-03-28 23:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b52506a951b3a4f7d1e50024ad06ed02 SHA-1: 3df8f9aca9ee59a87a17ef621dcb4f8b860ce058 SHA-256: 67de2c69c66356794dce217183ced0d6c7aeff5ee805aede00ad6ec8bdebdc5d
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, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://resalured.ru/wix?keyword=cwap+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365567/normal_5fdf6510daa5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385631/normal_5ffacdf02629f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_60140982c71b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5fcf0c9d45474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380699/normal_5fc994075c73b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_605b34eeb7461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_5fd8b3fd7c54c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_5fcc8ec8aa8d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9ae1c7fb-ca92-4d91-9c08-65bae4325654/tascam_dr40_manual.pdfIn PDF document text
    • https://a1caaca2-2281-43ca-b2b5-e8dcf6f2a4ec.filesusr.com/ugd/c6e36d_a3c2b023b0bd40e997da3ecc12214095.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_e84279047d1e4c199f8115ffdab445ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/nifefefefapanowoxotade.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/700r4_transgo_shift_kit_instructions.pdfIn PDF document text
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_6fc48e3d9caa47a98cbed3793cf57b44.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_910b4c5a2a4d415192e1dfb5fb814444.pdf?index=trueIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_b6c557040df04285965a5288c3e789eb.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_fb2dc1b4624346abbb4f42f9db65d2f3.pdf?index=trueIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_06b0006285dc4bf68401902aa4c801e9.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_6792495206514954b6bf02c6e3d10210.pdf?index=trueIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_842329fd76ba4e89b83860afc827306a.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_4d709d9fffa3457ea89871a6dcda9da2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1d2879-dd89-4cce-9aa8-9988c274710f/material_science_engineering_internships.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://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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 4884 bytes
SHA-256: c1a4b5d6fda40d9ffd25b8a548c07ad98721bb0b2a146474fac0d986702d42bb
font_01_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 12264 bytes
SHA-256: 56801209512e881aacee01548006b80ac50918f2bff13a454f72f40fb7bd0811
font_03_sfnt_off00013d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9A 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_04_sfnt_off000152c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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