Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac83da11d1e8c576…

MALICIOUS

PDF

72.6 KB Created: 2021-03-18 12:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd4758f52ca2d21fe84a87877e60093c SHA-1: 55110433e5bae4507a8f6324753dd4a83a122545 SHA-256: ac83da11d1e8c5767fa69c1c2ecb3f32886f5086fbfc45fce3b4e7b9788e15d2
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs, specifically `https://nipisod.ru/award?keyword=lala+ramswaroop+calendar+2020+pdf+free`, suggests the document is part of a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to download and execute further payloads, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/award?keyword=lala+ramswaroop+calendar+2020+pdf+free
    • http://imm-shoes2.club/adobe_creative_suite_cs2_freei4a2o.pdf
    • http://teenagetutor.online/89319171581baxpd.pdf
    • http://arm-watch1.club/vegidurigaminerewzdz9r.pdf
    • https://jumolemema.weebly.com/uploads/1/3/4/8/134853288/02e051981f640.pdf
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/berigudari.pdf
    • http://tekplafond.xyz/fezatedesepofijepivorf9ru.pdf
    • http://fasadi.site/47845720160ohcr3.pdf
    • http://mapotilij.mygamesonline.org/percy_jackson_greek_gods_ar_answers.pdf
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/7725edbc.pdf
    • http://3gusevshop.space/site_reliability_engineering_manager_job_descriptionc3w89.pdf
    • http://niwopofe.scienceontheweb.net/dapupenizorojijitupipoxux.pdf
    • http://xezixaz.getenjoyment.net/jugasigupimanoxakimizaz.pdf
    • http://habercigo.com/560483004150cyvk.pdf
    • https://judelewufajog.weebly.com/uploads/1/3/4/5/134516313/kalejumi.pdf
    • https://gobezovix.weebly.com/uploads/1/3/1/4/131454522/jenekeridejos-dizomofo-jopumovu-rewasid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sagotomagin/veropebesagasajazuwiku.pdf
    • http://gixejemazob.myartsonline.com/what_are_the_3_scrum_roles.pdf
    • http://gipebevu.atwebpages.com/18543879888.pdf
    • https://s3.amazonaws.com/wudibirewuduto/baby_birthday_song_pagalworld.pdf
    • http://rorazizaxaf.atwebpages.com/12907212703.pdf
    • https://s3.amazonaws.com/pibabopuduj/free_art_gallery_business_plan_template.pdf
    • https://s3.amazonaws.com/vavale/animation_composer_kuyhaa.pdf
    • http://velelakolifuvu.onlinewebshop.net/english_application_format.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_off0000de7d.bin
f47509130019e86e38d042275b1fa0156886eb70f030dde7299a6ff43b85feec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 5608 bytes
font_01_sfnt_off0000f191.bin
88efa168c9e12b58bf37a479bbbdfcb2f65c039b73178e3da7265694d3d26aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 10340 bytes

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