Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c2d4d36fc4329c…

MALICIOUS

PDF

66.8 KB Created: 2021-04-01 08:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 853cf972650f5a2ed02b6f1c44440c7e SHA-1: 1db17ab6a1f6c55f0dbb01c6ea1f84f71ae33548 SHA-256: a1c2d4d36fc4329cc6799f8967b6fd6bea5601021271e051b431f33f8cfd2fe7
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, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to educational materials, consistent with phishing tactics.

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://xezojetit.ru/wix?keyword=calculus+graphical+numerical+algebraic+ap+edition+pdf
    • https://xapiwelawuk.weebly.com/uploads/1/3/5/3/135341488/guzozusela.pdf
    • https://vavaxurose.weebly.com/uploads/1/3/0/7/130775274/6e613171d5841f4.pdf
    • https://static.s123-cdn-static.com/uploads/4372972/normal_5fe384931286f.pdf
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5ff240d816249.pdf
    • http://discount50.pro/competencias_para_la_vida_2011l0hz0.pdf
    • https://cdn-cms.f-static.net/uploads/4487191/normal_60438791d1599.pdf
    • https://bijigixeze.weebly.com/uploads/1/3/0/7/130739450/juwamabakajode.pdf
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/5352814.pdf
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/2ef1a23eead0321.pdf
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/335dbe2.pdf
    • http://detonic-ro.website/walgreens_humidifier_2065_manualysgdu.pdf
    • http://hamsterbig.com/pumuxevekebizoxipulamoxghx88.pdf
    • https://xizavuxovom.weebly.com/uploads/1/3/3/9/133986710/peviremas.pdf
    • https://veranaza.weebly.com/uploads/1/3/4/6/134665567/salerifozisosa.pdf
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/579205.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/71b1a3a4-f6c8-44f1-ab6e-385aa43598a1/31175425226.pdf
    • https://uploads.strikinglycdn.com/files/8c828d42-d5da-4d0b-b275-86e2cb85aa5f/kalowit.pdf
    • https://uploads.strikinglycdn.com/files/38bb2ee1-1605-4d1a-bfd9-bd4d6981bcff/polk_audio_subwoofer_psw111_setup.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_off0000c4db.bin
fefdbdc343c099187ffb2ddd1c3a8f7e60131d5f3a9e634a644a918fba927695
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 5612 bytes
font_01_sfnt_off0000d7ba.bin
0601fd1648b0e6b676aae50c45c489a4683e0063c23e7d4a230705b79eb9a5a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 10592 bytes