Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7c39628fb2a2f7…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 02:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8ab1facd01bc884e9a27e847381e0d9 SHA-1: 2168371bc5228dbc76eedf6781c2064ea44cf8d7 SHA-256: 6f7c39628fb2a2f71b30457d06212c94696377e5fca87c1b263ebd8bc1f3fdc9
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=geometry+ch+1+test+answers
    • https://static.s123-cdn-static.com/uploads/4407085/normal_5ff28e2a4aee7.pdf
    • http://xulepeban.22web.org/zopepomepomuviwera.pdf
    • https://static.s123-cdn-static.com/uploads/4366956/normal_5fe30e12753f7.pdf
    • https://cdn-cms.f-static.net/uploads/4366312/normal_6040181d7e4ce.pdf
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fe1d2942969a.pdf
    • https://cdn.sqhk.co/vigesiji/chiihSp/books_of_the_bible_word_search_puzzles_printable.pdf
    • https://cdn.sqhk.co/zakoduba/fjdmjgT/hello_body_usa.pdf
    • https://cdn.sqhk.co/sirepajaku/a8HhaHv/jirunizovuta.pdf
    • https://static.s123-cdn-static.com/uploads/4416321/normal_5ffc141528c4e.pdf
    • http://pijakonojimuw.iblogger.org/encyclopedia_britannica_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4462726/normal_6042005207ac9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vimitafukufes.rf.gd/software_tester_job_description_canada.pdf
    • http://favekagopu.epizy.com/51241567133.pdf
    • https://s3.amazonaws.com/gisujubolidine/harry_potter_audio_books_free_reddit.pdf
    • https://s3.amazonaws.com/kisimujuk/spongebob_rainbow_template.pdf
    • http://fafinonez.rf.gd/78796600067.pdf
    • https://s3.amazonaws.com/negonanopix/high_school_chemistry_lab_report_format.pdf
    • http://navipulazem.epizy.com/73420422086.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef62.bin
6ef2b7539bea7e40e915e8b7fe866639d28be4b85d1075859bafba1412528583
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 5024 bytes
font_01_sfnt_off00010064.bin
67f6559183ef845a1dce1b96542f2314c236f66bb5d8b0e8d75c40fdb37a7636
pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 10384 bytes
font_02_sfnt_off000123a1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 4324 bytes