Malicious PDF — malware analysis report

Static analysis result for SHA-256 4200cad761a9a3f1…

MALICIOUS

PDF

65.0 KB Created: 2021-02-25 16:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b942f8879cfe4d6bad820079fb46cf4 SHA-1: 5279b63467f4be47024d143c80a44b0f0f8dcda5 SHA-256: 4200cad761a9a3f1ba231eb5b34027271264d012319b256755bf9dff76ff8b7e
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a suspicious domain, which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'introduction to sequences answers'. No scripts were extracted, but the presence of external URIs and the overall malicious classification strongly indicate a phishing or malware delivery attempt.

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://druttle.ru/wix?keyword=introduction+to+sequences+answers
    • http://wapividazofar.scienceontheweb.net/graphic_novels_for_grade_3.pdf
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/xikel.pdf
    • https://cdn-cms.f-static.net/uploads/4417138/normal_602a07d1bd608.pdf
    • http://poxumanavofeboz.scienceontheweb.net/windows_system_administrator_l2_interview_questions_answers.pdf
    • http://desokore.medianewsonline.com/ruzikazefekawox.pdf
    • http://sijubuwejipamun.mywebcommunity.org/wuwoxib.pdf
    • http://jotipire.iblogger.org/32238811256.pdf
    • http://gexopidikimo.mygamesonline.org/do_navy_officers_get_reenlistment_bonuses.pdf
    • http://tepugorotewole.medianewsonline.com/alan_watts_wisdom_of_insecurity_book.pdf
    • https://galewijukinez.weebly.com/uploads/1/3/2/6/132695540/fuwemor_falonibamo_zeledevoxun.pdf
    • http://vanimerukaguto.scienceontheweb.net/datufomamezisun.pdf
    • https://static.s123-cdn-static.com/uploads/4387061/normal_5feba992e144e.pdf
    • http://xisulekotitis.iblogger.org/55965558617.pdf
    • http://vitofemegawe.getenjoyment.net/6080223072.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuvarijes.atwebpages.com/61004789344.pdf
    • http://tifilumiteva.epizy.com/69561757409.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_off0000c60f.bin
57a634a27c19dc735d067e638ae4f9736a95e7cb6e8e5979e632820d092e623a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC60F 5056 bytes
font_01_sfnt_off0000d758.bin
55e1773d63beb69ea0640ea0e149b3390a8a57a9bbd1914da96640eb8fec07ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 9340 bytes