Malicious PDF — malware analysis report

Static analysis result for SHA-256 a883f5202aaaa9f3…

MALICIOUS

PDF

86.4 KB Created: 2021-05-13 17:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27b50fc1f0a9a8536af2950a8d8f5169 SHA-1: 71f649160caf0c256f02196b182485cefa14d6e5 SHA-256: a883f5202aaaa9f32a1fcd613a4efeadc9f82c2840585506196ed263947e2129
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to scholarship letters and includes an external URI pointing to 'zajinet.ru/strik'. This URL is likely the primary payload delivery or phishing destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=how+to+conclude+a+scholarship+letter
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5fef8bdebffed.pdf
    • http://pifedalune.medianewsonline.com/21618935398.pdf
    • http://leninuludobodu.mygamesonline.org/66190558104.pdf
    • https://cdn-cms.f-static.net/uploads/4484610/normal_6066642632826.pdf
    • https://cdn-cms.f-static.net/uploads/4454543/normal_603951b7c47e7.pdf
    • http://rokamik.iblogger.org/compound_sentences_worksheet_6th_grade.pdf
    • https://static.s123-cdn-static.com/uploads/4427097/normal_5ff4cec2a40aa.pdf
    • http://rezexepenoma.scienceontheweb.net/simivomoxavino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/futamo/anywhereusb_2_software.pdf
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_b12efd11e5994ae4a51e231d89ff8046.pdf?index=true
    • https://s3.amazonaws.com/banula/ballarat_tv_guide_thursday.pdf
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_363365261b164bc7a6f2e48e1b831707.pdf?index=true
    • http://sokiseg.rf.gd/82212295063.pdf
    • http://pazepoxi.atwebpages.com/zamadun.pdf
    • http://vedixemalirugi.atwebpages.com/63674133876.pdf
    • http://tafiwepamubov.atwebpages.com/graco_duetconnect_swing_and_bouncer_batteries.pdf
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_c0f0dfdd65e3435f9222e415b72b7c00.pdf?index=true
    • http://jezevenakos.myartsonline.com/borax_bead_test.pdf
    • http://nodefojabotozij.rf.gd/holiday_office_party_flyer_templates.pdf
    • http://ribaxexumipo.rf.gd/kala_dj_song.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_off00010805.bin
9698948e1dd7b017b91a2dfe20dbeebbf88bd1ddec0472943bd7dab0cd4c6dd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 5096 bytes
font_01_sfnt_off00011953.bin
3bf78460cb129adec0ac00c899840db17338947ec6fe24ddae25b5861df5273d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 10708 bytes
font_02_sfnt_off00013df0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF0 4324 bytes