Malicious PDF — malware analysis report

Static analysis result for SHA-256 766e7c2a5610b013…

MALICIOUS

PDF

79.0 KB Created: 2021-03-12 14:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d23e81cd6237df729cb3c03b19683aa SHA-1: d1b87d05ee27adbcb84540a9de5c92967bf6a2f6 SHA-256: 766e7c2a5610b0139e780e70aba81a0bb9591ea2308cc8f9d311bec3e037ebfc
134 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many of which point to disposable hosting and are indicative of a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Gta 5 mod apk for android download', aligning with the lure of a fake download. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this document is part of a phishing or malware distribution campaign.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/wix?keyword=gta+5+mod+apk+for+android+download
    • https://cdn-cms.f-static.net/uploads/4424981/normal_60214d3f6e301.pdf
    • http://vuroxinizona.scienceontheweb.net/jawagebukosuj.pdf
    • http://dosaxixapaxa.medianewsonline.com/68611909147.pdf
    • https://bixixadapi.weebly.com/uploads/1/3/5/3/135321875/79ebd53cc.pdf
    • http://kakorezikudu.mypressonline.com/26659620800.pdf
    • https://mepopukivar.weebly.com/uploads/1/3/6/0/136083549/2608361.pdf
    • https://cdn-cms.f-static.net/uploads/4476294/normal_6047fb48e3eb5.pdf
    • http://fovikoxesaweziz.medianewsonline.com/89718261584.pdf
    • http://ziwigosopijulal.mygamesonline.org/year_7_maths_algebra_worksheets.pdf
    • http://gedadekenoz.mywebcommunity.org/noxonakinugonej.pdf
    • https://repewagisax.weebly.com/uploads/1/3/5/3/135319399/setimeb.pdf
    • https://jubiporosevuzu.weebly.com/uploads/1/3/2/6/132695682/1115804.pdf
    • https://cdn-cms.f-static.net/uploads/4385207/normal_6036d6ebd1bec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_e5c79e6593fa4e30a4b55485a77abf7e.pdf?index=true
    • http://solezod.myartsonline.com/10th_class_biology_textbook_download.pdf
    • http://lufopudizomuv.atwebpages.com/gibabakubikusujar.pdf
    • http://zorikeroz.onlinewebshop.net/disadvantages_of_social_media_on_students_academic_life.pdf
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_bc100b7451e745b491a4d87a90874582.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f714.bin
dd180cbf5379b6f60952b4d78e2ed2cbe7ab135a2976cb6e3203405f1c2b5837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 5320 bytes
font_01_sfnt_off00010938.bin
e3279b9a7b7237a8c12142276a211d48787e94c4f0d244d4f9a91d51f32a2363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 11068 bytes

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