Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfaa20969092f26…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 09:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13fee90bb83db4501a176ab77fd07b17 SHA-1: b08a20926fe49c96870bbcc6cefd0e64fa5b62cd SHA-256: 3cfaa20969092f266c57719e23ab489233efc63bfbc1e6ab0f941e7e8592e230
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically the URL https://yafferge.ru/123?utm_term=geometry+worksheets+high+school+with+answers. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, suggesting a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=geometry+worksheets+high+school+with+answers
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5fe508ccba3fe.pdf
    • https://cdn-cms.f-static.net/uploads/4481270/normal_6030a230e68e2.pdf
    • https://cdn.sqhk.co/deguxikezu/dighd6M/skull_wallpapers_1080p_free_download.pdf
    • https://cdn.sqhk.co/tuwetebep/fFW0Kjc/color_picker_macos_hex.pdf
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fcc6a34ca918.pdf
    • http://bawoputameded.iblogger.org/12119819200.pdf
    • https://cdn.sqhk.co/duvetezoje/bUigeig/55479721100.pdf
    • https://cdn.sqhk.co/fifenije/hgE50rn/zogumuw.pdf
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fd76d7b0eb8c.pdf
    • https://cdn.sqhk.co/levowexesu/hbidLEm/real_drift_bike_racing_apk.pdf
    • https://cdn.sqhk.co/savageven/hhiihie/tujuwusopapu.pdf
    • https://cdn-cms.f-static.net/uploads/4458388/normal_600b8ff7b099f.pdf
    • https://cdn.sqhk.co/vofonowul/3V2rjhM/weather_forecast_delhi_tomorrow_hourly.pdf
    • https://cdn.sqhk.co/tategupet/7iiWgjS/free_slots_download_for_windows_7.pdf
    • https://cdn.sqhk.co/sozasusu/jrgijiC/27730773839.pdf
    • https://cdn.sqhk.co/pabelewexo/tggygiF/free_throw_line_basketball_term.pdf
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5ffc4c1f10935.pdf
    • https://cdn.sqhk.co/bugolajoxodu/dhh9h5l/defender_2020_price_in_sri_lanka.pdf
    • https://cdn.sqhk.co/kulobibab/jSjdPmz/vetaxarapik.pdf
    • https://static.s123-cdn-static.com/uploads/4466143/normal_5fc80edc67856.pdf
    • https://static.s123-cdn-static.com/uploads/4420586/normal_5feb64913d40f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fozovevozasox.epizy.com/nepebelirojawivew.pdf
    • http://gonigitipobezom.epizy.com/comptia_a_902_questions_and_answers.pdf
    • 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_off0000f91a.bin
4ebfa4e9573a5d97c7f57280530f3824741a40e774f0bc897a6412f91e6698c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 5500 bytes
font_01_sfnt_off00010bca.bin
21ee5d66ac8eb1044be569e82f247eb4e94d81bd25dd99eb4e3ff465d5df0a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 10728 bytes

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