Malicious PDF — malware analysis report

Static analysis result for SHA-256 d802e5c2ceeea4dc…

MALICIOUS

PDF

80.4 KB Created: 2021-02-07 15:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c10799dd89fd49427dba47153211ec5a SHA-1: 24b037f099d1398c82d1f55fbc0e808d0739d69a SHA-256: d802e5c2ceeea4dc371116441962efac9dc7f6f232646b205b3be91ce71ff266
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. An external URI heuristic points to the URL 'https://bologen.ru/wb?keyword=one%20hour%20later%20worksheet', which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wb?keyword=one%20hour%20later%20worksheet PDF link annotation
    • https://cdn.sqhk.co/givogaduta/zmgdOPE/green_the_planet_2_cheats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448343/normal_5fceef44674cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fdf2cf0a8785.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/eid1gh9/redbubble_reviews_bbb.pdfIn PDF document text
    • https://cdn.sqhk.co/bivaxijo/jidhjhc/worlds_hardest_game_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481155/normal_5fc9a02355562.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5fef376972a1b.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/chaBih9/zizilifofuzigavabitovimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_5fe956f631650.pdfIn PDF document text
    • https://cdn.sqhk.co/gejikofoxaf/KhfF5RM/xuligizapumewevegak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_600acc0be759c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482853/normal_5ffcbb929f75b.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/haugcqH/zixojaperopuzepagutowaji.pdfIn PDF document text
    • https://cdn.sqhk.co/xijodepub/ahbEsxB/vubomurezimemidizer.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/17T4rKo/one_punch_challenge.pdfIn PDF document text
    • https://cdn.sqhk.co/fifenije/hiSgjks/9841034089.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/jdhejaw/mepobanatoritapetepulago.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
    • https://s3.amazonaws.com/xaliwalufoguni/let_it_go_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/nelson_mathematics_grade_7_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/rosubofujapum.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/exception_handling_in_c_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/exceptionininitializererror_android_static.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_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 4788 bytes
SHA-256: 0a74c8a99b3b651e3d1895ab8f07cbe148b3995519470a8ebe065512d4467f90
font_01_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10588 bytes
SHA-256: 29513b253eadf15af78c6a1ac31946cced5123a1b4aa781893fc709876861f5b
font_02_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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