Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f676fabe4a4db3…

MALICIOUS

PDF

79.9 KB Created: 2021-03-06 08:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d45feba4d1a19cc8d7f9f0a218e7ae90 SHA-1: 1eba1e6629e201d38f319bd56ac33ed3c9d1fb85 SHA-256: c1f676fabe4a4db30db89881346d31a1f2322a7824c90400317d1472b629246e
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and embedded URLs. The document body, though partially obfuscated, contains text related to 'chess learning game free download', suggesting a social engineering lure. The primary malicious URL, https://ponafet.ru/strik, is likely used to redirect the user to a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/strik?utm_term=chess+learning+game+free+download
    • http://nutejujaxi.66ghz.com/ritopumijekadavofilubo.pdf
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/fuwadup.pdf
    • http://bixaxivajujojar.mypressonline.com/how_to_remove_pimple_marks_at_home_in_hindi.pdf
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/7108179.pdf
    • http://xoriruviridov.22web.org/zogofotido.pdf
    • http://zokugorevat.mywebcommunity.org/dewalt_d55146_compressor_regulator.pdf
    • http://depepuxuri.22web.org/juzasu.pdf
    • https://sewetupowak.weebly.com/uploads/1/3/5/9/135971958/womiwiterula.pdf
    • https://gigemapafinul.weebly.com/uploads/1/3/1/3/131398374/wipofadazoru-jifozowubopofat.pdf
    • https://cdn-cms.f-static.net/uploads/4409628/normal_5fdbc0ea6823d.pdf
    • http://rawoxaxevog.mygamesonline.org/26637737268.pdf
    • https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/7540437.pdf
    • http://kojovud.iblogger.org/kowogosikawukatebu.pdf
    • https://static.s123-cdn-static.com/uploads/4421460/normal_6006b165e5a0a.pdf
    • http://nemosixumeki.mypressonline.com/2411964619.pdf
    • http://jepenufi.getenjoyment.net/why_i_dont_want_to_go_to_school.pdf
    • http://gigogon.22web.org/lamunovunawuboja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pewibim/excel_sheet_forms.pdf
    • https://s3.amazonaws.com/wujixus/english_grammar_conjunction_worksheets.pdf
    • http://tunowik.epizy.com/7518805886.pdf
    • https://s3.amazonaws.com/baritexovopa/alphabet_printables_with_pictures.pdf
    • https://s3.amazonaws.com/limepusotanal/45412710357.pdf
    • http://voxaxos.rf.gd/what_is_service_blueprinting_in_operations_management.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_off0000fd94.bin
a7b26c4f1f01d5a2769a8128b360ce8ae19f78aeec9168663c344c9b017c9229
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 5316 bytes
font_01_sfnt_off00010f86.bin
708831fa3271f9ef0892ec36b9fa9ed2021a7e378a7efd7ab7e0bde250cb1b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 10184 bytes