Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8fafff29c58bf1…

MALICIOUS

PDF

69.4 KB Created: 2021-06-01 02:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5be5c409188431aac328e2c9b95022b SHA-1: 91bccf380fd78900aecf96301ede6d47e5f45caf SHA-256: fa8fafff29c58bf1e48976f3f44775127b40d37d66c4636a8d7ec20421fd10ed
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to host a malicious payload or redirect to a phishing page. No scripts were extracted, but the presence of external URIs and the overall detection suggest 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://cructi.ru/pbw?utm_term=rotations+about+the+origin+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4497081/normal_606a027727df1.pdf
    • https://cdn-cms.f-static.net/uploads/4403128/normal_6037f99ce359e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0b8e475c-90a3-425f-ad6e-976c17c9cb98/tujibarugibesixa.pdf
    • http://nilanom.pbworks.com/w/file/fetch/144416835/progress_in_mathematics_grade_2_workbook.pdf
    • http://xalomuzavege.pbworks.com/w/file/fetch/144433374/how_to_get_the_radius_of_a_sphere_from_volume.pdf
    • http://zikasamu.pbworks.com/f/vixiwiropagawuwuwitonizuk.pdf
    • https://uploads.strikinglycdn.com/files/d06be626-e755-4c56-bc8d-60f1aafeb0c8/54869049109.pdf
    • http://vowujepojez.pbworks.com/w/file/fetch/144427335/54254984990.pdf
    • https://uploads.strikinglycdn.com/files/8ba2031b-e7af-4473-829f-e01891683c0e/59217325947.pdf
    • http://natizasex.pbworks.com/f/business_proposal_sample_docx.pdf
    • http://kedetuwi.pbworks.com/f/68949923709.pdf
    • http://wiwedano.pbworks.com/f/67978952431.pdf
    • https://uploads.strikinglycdn.com/files/11c9020e-06d5-44d6-ada2-511645a6ff3d/51566308566.pdf
    • http://kalunagepigi.pbworks.com/w/file/fetch/144425049/darazakoxo.pdf
    • http://lugozamuxika.pbworks.com/f/ppp_loan_forgiveness_disclosure_example.pdf
    • http://garigor.pbworks.com/f/40376545741.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_off0000d1a7.bin
3cb1f302be886d1c9241fb66d678a59a74ccedd1ae1b4bcd4ed950fa2ce2f874
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 5572 bytes
font_01_sfnt_off0000e4a3.bin
38bebc2c5d4bbde1fabec7315fcfefecbfd7742f10654c8bdd5c801cef226ec3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 10448 bytes