Malicious PDF — malware analysis report

Static analysis result for SHA-256 186a65c93dd231e8…

MALICIOUS

PDF

82.6 KB Created: 2020-11-24 20:24:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: db72bcff2fca8b3ac4e85c440cd8dc3d SHA-1: 188ddfdc02a81d36b9a663d889f2aaa5a53fc3f7 SHA-256: 186a65c93dd231e800cf247394f279718cc0a7438ae3e06f7efba9a9029039f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of numerous external links, with one pointing to 'trafffi.ru', suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=el+verbo+ser+worksheet+answers+quizlet PDF link annotation
    • https://vitedilerag.weebly.com/uploads/1/3/4/3/134344875/pujid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f89cb6f76bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_5fafd1eba68bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f8aa7ec9e709.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6878ada2-3548-48c8-9944-0dd65a641d35/az_screen_recorder_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533fb018-38d2-434c-8a60-c9e65d8da06d/national_sorority_of_phi_delta_kappa_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fbc9c59-3ebe-4028-bea4-c2fd13386eb7/27679283015.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/direkinigipomus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b52782-5759-4bfc-a19f-373c67ceb11b/wutirarufokorawuxudur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e634e3-03ad-43cd-a9d2-374e33d1b998/10498733666.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/quran_shareef_by_fakhire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b36de62-7d2b-454d-ad92-a839d6c549b4/zapitipop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 5260 bytes
SHA-256: 9098fea6a7f497135381006957e6f649284f4c762f110e756a07507b7fb9f460
font_01_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 12568 bytes
SHA-256: 509dd2fb7ce7d6a1860f81ef3b568e559b48a7fa451e2abad91631329647c67f
font_02_sfnt_off00012833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12833 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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