Malicious PDF — malware analysis report

Static analysis result for SHA-256 2087aa3f4a81a264…

MALICIOUS

PDF

75.8 KB Created: 2021-04-04 00:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d849b359c4b375da89ee17b06ab7327 SHA-1: 73641de62f3c8d2489c2eaa41620563fe881e029 SHA-256: 2087aa3f4a81a264558bef8f42bc7e35242c897aa15efdcd05852175d94cc4b4
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. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to educational content, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/wix?keyword=chapter+10+blood+answer+key+pdf+anatomy+and+physiology
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5fdff82668688.pdf
    • https://limowidijepa.weebly.com/uploads/1/3/5/9/135992559/witupedopibelo.pdf
    • http://ratedewu.scienceontheweb.net/bihar_si_syllabus.pdf
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6016c23b52560.pdf
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/811486189.pdf
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fd635a648caf.pdf
    • http://yourbigdick.space/jibazunamifodojavv0yxz.pdf
    • http://pafowitowa.medianewsonline.com/rumuxitewozakarokoxabi.pdf
    • https://vagoledos.weebly.com/uploads/1/3/5/3/135320004/4178151.pdf
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/xadetisogap-kumovi.pdf
    • https://static.s123-cdn-static.com/uploads/4403818/normal_5ffb9fc9a6b00.pdf
    • http://meetsalle.xyz/puretubuxokilr1r1o.pdf
    • http://vetobiz.sportsontheweb.net/diferencia_entre_absorcion_y_adsorcion_en_quimica.pdf
    • http://worameruvejaka.mywebcommunity.org/spiderman_para_colorear.pdf
    • https://gizaluta.weebly.com/uploads/1/3/5/3/135345368/8365142.pdf
    • https://nuwukovodikala.weebly.com/uploads/1/3/4/6/134666266/naweke_tapodamuvevot.pdf
    • http://pefiworawodud.mypressonline.com/selajitopabun.pdf
    • http://gisoboxizaza.mygamesonline.org/78863978449.pdf
    • http://xevojifixifepi.scienceontheweb.net/31040618550.pdf
    • http://vukufitu.mywebcommunity.org/67064031839.pdf
    • https://xajasobuz.weebly.com/uploads/1/3/4/8/134861619/dalekabomanet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://roxujewov.myartsonline.com/what_is_history_of_law.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_off0000e3c6.bin
3a0705bfe11b9795ad2369136d564c3cfb80e1259cc32522be8eb6ff49f6666b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 5952 bytes
font_01_sfnt_off0000f7ee.bin
b4fb083aceba6decfba6b2dba6782055ac6b5509891d5d26d8c809fdd15106ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 12808 bytes