Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39a340b93dec26d…

MALICIOUS

PDF

74.0 KB Created: 2021-03-20 12:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2134fe74acdf01c6ac9b4403b0d00d5c SHA-1: df6f98abc53830b70683780617e66be02d2b0a12 SHA-256: a39a340b93dec26d2111caeae39b6085e3bcf5192ecd0b8cdacd1c0916976144
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded URL points to a domain that is likely malicious and attempts to disguise itself as a worksheet. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further malware delivery.

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://xajibur.ru/award?keyword=perimeter+and+area+of+polygons+worksheet+pdf
    • http://fuzirirofo.iblogger.org/mudumuj.pdf
    • https://cdn.sqhk.co/jalexire/W2hdNpK/sharp_aquos_net_netflix_app.pdf
    • https://cdn.sqhk.co/wuwosexed/fLznbgT/sexogoluvijunupodat.pdf
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/4df32b4ba36bc3.pdf
    • https://tovibibuxajewen.weebly.com/uploads/1/3/5/9/135968099/vaxejupelu.pdf
    • http://kekijojovif.sportsontheweb.net/gomafifakafexoser.pdf
    • http://rejawulomov.mywebcommunity.org/59550861415.pdf
    • https://cdn.sqhk.co/xegunorasu/pjaihxa/within_temptation_vocalist_name.pdf
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/gaziwuzeke_julojimo.pdf
    • http://piwulag.sportsontheweb.net/dawomivitaveluvadebax.pdf
    • http://fasumidivojasuj.iblogger.org/how_to_program_remote_genie_pro_screw_drive.pdf
    • https://cdn.sqhk.co/dajebala/jtkhigd/rafesekurerovajofenozo.pdf
    • https://cdn.sqhk.co/poxedomeke/mxs1Hjj/business_analysis_certification_canada.pdf
    • https://guxeximufi.weebly.com/uploads/1/3/4/2/134235584/2186543c94be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/93e585da-7fd1-4f73-bb0b-39e616f1b612/simosarigusalidorov.pdf
    • https://uploads.strikinglycdn.com/files/3b472482-2c2a-436c-9d83-ff42ccfe5c6e/la_siesta_del_martes_gratis.pdf
    • http://lijazujarakowom.epizy.com/android_10_beta_samsung_s10.pdf
    • https://s3.amazonaws.com/rufonali/alesis_micron_user_manual.pdf
    • https://s3.amazonaws.com/kuxuxemu/konix.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/6659515501.pdf
    • https://s3.amazonaws.com/fokapikow/quran_arabic_uthmani_text.pdf
    • https://uploads.strikinglycdn.com/files/8e22481b-b6bc-4d11-a1ef-d46840202f79/what_is_the_meaning_of_apple_tree_in_my_dream.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_off0000e32a.bin
a37d6126d4e01af1d5b5b98f7143bb604908f7b8d151d0a87996569a21b060b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 5712 bytes
font_01_sfnt_off0000f691.bin
5f4adb5e4290297248f62f9201ec1e2c8c75666ca0eb2c5cd398d015648f69e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 10628 bytes

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