Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c2d8504f53aa55…

MALICIOUS

PDF

74.3 KB Created: 2021-02-20 00:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 10a0045211dee9c34602901b609a67dd SHA-1: 54aef5009f6c41d89e9297130341d1e974dacbd9 SHA-256: d8c2d8504f53aa55c1244e6bd50a3a2cb84df66eb6cbbba7043b94412fd11f0d
134 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting services, suggesting a link farm or distribution network. The presence of a 'download button' heuristic and the ML classification indicate a strong likelihood of malicious intent, possibly to deliver a second-stage payload or redirect users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Malware.Agent-9966249-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Malware.Agent-9966249-0
  • 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://seumenha.ru/strik?utm_term=twilight+saga+eclipse+full+movie+download+english PDF link annotation
    • https://zoninezazazi.weebly.com/uploads/1/3/1/0/131070362/sipobupek.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/bSjalKp/head_soccer_hack_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/jhqicPB/best_learn_how_to_play_piano_app_free.pdfIn PDF document text
    • https://romagazep.weebly.com/uploads/1/3/4/7/134759296/9983688eea87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_602ae1a17e58c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_6014f37a7c1e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_5fe990593366a.pdfIn PDF document text
    • http://xiluzoxasefeb.iblogger.org/kidonozidebojib.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/1gjjfeP/62530884714.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/c3cab623b30.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/telumo_voxasesiful_bisojerebafef.pdfIn PDF document text
    • http://supanigavig.iblogger.org/finance_wordpress_theme_free.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
    • http://regipikiwubadov.epizy.com/despacito_song_djpunjab.pdfIn PDF document text
    • http://vifoxakusawe.rf.gd/how_much_do_diesel_mechanics_make_in_florida.pdfIn PDF document text
    • http://xajeladegafu.epizy.com/23336922453.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 5456 bytes
SHA-256: 1d7534591207255aaeed5967d520ae1b5537f81c25d2f109565d3e18da4b46bf
font_01_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 10328 bytes
SHA-256: f5dd074bf842dbf6f305c2f15ed90965a0965035b24a4256f579ffd5415971ad
font_02_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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