Malicious PDF — malware analysis report

Static analysis result for SHA-256 caefebcc3dde2e04…

MALICIOUS

PDF

74.1 KB Created: 2021-03-29 19:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e01164e928fff1af9f8d936ec1da875d SHA-1: b2065ecec299ed88cc514575c7d14f2e039df6e2 SHA-256: caefebcc3dde2e0491e9c13645f020c547e8648955aa2173a93e3fd6eec25a61
136 Risk Score

Malware Insights

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

The PDF contains multiple suspicious and external URIs, with one specifically flagged as an invisible link to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/award?keyword=iso+aperture+shutter+speed+cheat+sheet+pdf
    • http://shoplus.info/124967061907k9l6.pdf
    • http://zifeladawu.scienceontheweb.net/attention_deficit_the_brain_syndrome_of_our_era.pdf
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/xebemuwoze_tupumokabenu_vawurik_wuvug.pdf
    • http://jepisafidezegun.scienceontheweb.net/duxabunipedubivegafila.pdf
    • http://gayerkan.com/47390641436z6hlj.pdf
    • http://gopudumimipabol.mypressonline.com/bedatazik.pdf
    • http://rameautbxy.space/simpson_3100_pressure_washer_partsr9tmm.pdf
    • https://static.s123-cdn-static.com/uploads/4416930/normal_6007d76cd8307.pdf
    • https://cdn-cms.f-static.net/uploads/4530070/normal_5fd7b8314a3dd.pdf
    • https://kexujutexaz.weebly.com/uploads/1/3/1/8/131858540/5586555.pdf
    • http://kozidozilujivox.getenjoyment.net/gokipunerovu.pdf
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/sovif.pdf
    • http://daravto18.ru/sunobevosekelajiwiipmx.pdf
    • http://securitycheckingbrowservkcom.xyz/laveretogifekegjrqe.pdf
    • http://nibelv.xyz/58964390777hnwak.pdf
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/9772658.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/najipavez/29824773881.pdf
    • https://s3.amazonaws.com/zijivevip/lupesewigesonurito.pdf
    • https://s3.amazonaws.com/zodawanuror/zosiranilojuzinuzadefuz.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_off0000e4d9.bin
35f09f3c13c0ce4206896a8fd89dd162bedb4a825c1d9bb0ac5188b7c1058c36
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 5148 bytes
font_01_sfnt_off0000f657.bin
7e50a4a7d84ead1f19e6eea542fb6510515c3f4c3b6d41b8089bb442bfff9f98
pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 10764 bytes