Malicious PDF — malware analysis report

Static analysis result for SHA-256 a622d8f0ea869a2c…

MALICIOUS

PDF

75.5 KB Created: 2021-02-19 14:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 943702a32f16de6651e80a5dc00c6dd1 SHA-1: 7070c199ac64975073702f9bd0e36b3ab5a69323 SHA-256: a622d8f0ea869a2cb2c2484608543beb3d02088eb62d6b5e1e1417d20f24490b
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URI points to a URL that is likely part of a phishing or malware distribution scheme, disguised as a '2nd grade reading comprehension workbook pdf'. No scripts were extracted, but the presence of an external URI suggests the document is intended to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/aws?utm_term=2nd+grade+reading+comprehension+workbook+pdf PDF link annotation
    • https://cdn.sqhk.co/winelolibug/JrpcggU/hill_climb_racing_best_vehicle_for_junkyard.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_6023ad096da44.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/zYijdpE/last_shelter_survival_vip_shop_worth_it.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/vicQhfX/29667186075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470218/normal_5fddfa144917f.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/je52Uie/origami_flower_rose_instructions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_6008abc42dc50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_5fd829bbd2582.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujopoweter.rf.gd/brooks_brothers_dress_shirt_sizing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/87045798122.pdfIn PDF document text
    • http://gozozofufeb.rf.gd/logixoxalatifuza.pdfIn PDF document text
    • http://zigazus.rf.gd/15585885563.pdfIn PDF document text
    • http://gemunedipu.rf.gd/bogoh_kasaha_mp4.pdfIn PDF document text
    • http://gibapomidumitar.rf.gd/bimanual_technique_for_palpating_the_abdomen.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/catalogo_cklass_primavera_verano_2019.pdfIn PDF document text
    • http://memaded.epizy.com/16782316410.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/system._windows._forms._notifyicon_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/vujobexotirotesonogid.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/bang_bang_ariana_grande_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/math_worksheet_generator_subtraction_with_regrouping.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/speed_dating_esl_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/vudubufitowaregafutajop.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/credentialing_approval_letter_template.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 5868 bytes
SHA-256: a2ba06eab4658a38fd714552c9d2bcc4a69d05123230cee25e73207dff32672f
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 10372 bytes
SHA-256: 3317ceed861f31cf6fd66ecf42e585c4d485ff4673af61a0d12678386be47406

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