Malicious PDF — malware analysis report

Static analysis result for SHA-256 a496e96ab35c0b9c…

MALICIOUS

PDF

80.3 KB Created: 2021-03-16 04:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0d3fd60dec5c0db1b1a2c8f06048069 SHA-1: 711b11e748f5a041aefdf4b952301a32a70e10b8 SHA-256: a496e96ab35c0b9cd399a60838b4545a924e7a6922ee7628630aefb82cc938ba
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. The embedded URL, disguised as a syllabus, points to a suspicious domain, strongly suggesting a phishing attack. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of malicious intent, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=bsc+2nd+year+chemistry+syllabus+pdf
    • https://cdn-cms.f-static.net/uploads/4424328/normal_6018e6e2d39ec.pdf
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fcbc05c23024.pdf
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/xoper.pdf
    • http://zafikapasipugog.medianewsonline.com/7887947432.pdf
    • https://cdn.sqhk.co/pazaxefuma/hYFiVif/football_penalty_shot_on_goal_today.pdf
    • http://worameruvejaka.mywebcommunity.org/complete_guitar_chords_book.pdf
    • https://cdn-cms.f-static.net/uploads/4468261/normal_6037b59470063.pdf
    • https://cdn.sqhk.co/fatifofab/ibLIhij/nosoguzikojitamararo.pdf
    • https://webexozaputer.weebly.com/uploads/1/3/2/6/132681415/cd8a36e889bdbf.pdf
    • https://cdn-cms.f-static.net/uploads/4469836/normal_600ebc64bc545.pdf
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5fffb763a92c0.pdf
    • https://cdn.sqhk.co/zoluxoni/f6fTxMC/27673188695.pdf
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/pupolekuzajekuwu.pdf
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/3581266.pdf
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/mojesubawagafibiz.pdf
    • https://cdn.sqhk.co/naziwixolagu/kYgdFif/game_bully_anniversary_apk_data.pdf
    • https://cdn.sqhk.co/valujoper/jbhbigV/zukisive.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bukezodebas.onlinewebshop.net/amenaza_y_trabajo_de_parto_pretermino.pdf
    • https://uploads.strikinglycdn.com/files/c6f5b77c-588d-4b3e-82d7-c3530c0779a4/jewekawukexedopav.pdf
    • https://uploads.strikinglycdn.com/files/48cfa5f3-63d1-444f-90ac-1456318c4002/89186790818.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_off0000fb46.bin
3f7d679231912959fa4bbb30e07da552b12809d6445d9d9bf4730aaf541786ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 5816 bytes
font_01_sfnt_off00010ef2.bin
322b0a0691a27ad46f41843485523ea0e3fd52335c0ead0d1a7425ad10ecc6a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 10924 bytes