Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9748b47eaacd632…

MALICIOUS

PDF

76.7 KB Created: 2021-05-01 22:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1d41c6bb06b0a98d0b5d07723f59ec5 SHA-1: 4e690224fa06ff1374ddecd5f25b3cbbc4c8519b SHA-256: a9748b47eaacd6329ca7cadb464f6a6a793b9e3e99775c7b0f3a4f810bfbd444
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The presence of a URL with 'logo making app for pc download' in the UTM term indicates a lure to download software. ClamAV and ML classifiers confirm the malicious nature of the PDF, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=logo+making+app+for+pc+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417423/normal_600de13bc1992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_60371fe373f3d.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/MhiggeR/xebezozunid.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/7jjfif8/magapofimina.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/f6jbhgM/49766217784.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/gcSggpu/absolute_rc_plane_sim_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxofalu/Ljh3OaD/just_drift_away_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5ff50cedeb5ba.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/hjib7Jj/ibps_rrb_notification_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuxona/teicVt0/magic_snake_36_star.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6b89c2f-dc7d-490d-a648-077c51828da9.filesusr.com/ugd/29ab01_ac0e3edef4d741509d301a819e9bf5d1.pdf?index=trueIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_a434bd62102e4e7ab1a991263cc999a2.pdf?index=trueIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_9203e48b721f43e997f7cb1a392b1034.pdf?index=trueIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_9cd50bb8fa5641f4a7115ead632dedc4.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_559b8a01cf9043429c714263b1ea58f3.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_14efb916fdc34a6f958c717a7bb96306.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_7cf20354f53d417698fd8e10a74f0cd2.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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 5392 bytes
SHA-256: 14d4b5167c1c354a6a3c9cb31223afb7ea9541e527c363f9237820381d6c8eb7
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 10540 bytes
SHA-256: 2d8c0af56afe40821a69da7109e725966de6c276c3f1c825010e7dab238f8abb

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