Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3d8044b75f5580…

MALICIOUS

PDF

90.2 KB Created: 2021-03-20 18:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3624f8e924d91f40e9a9bd7d262ff965 SHA-1: d2d0bbe54905a0b5287bfe856ef3aa5902532b0e SHA-256: 0c3d8044b75f558077779b7035c94c0a26dfb401f870ea80d7061b3cd794b3b4
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains an embedded URL that is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. No scripts were extracted, but the presence of embedded URLs and the ML/ClamAV detections strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=realidades+3+prueba+answer+key
    • http://zinefikitozozeg.sportsontheweb.net/kibotareribabokowek.pdf
    • http://loxiturizule.sportsontheweb.net/urine_microscopic_examination.pdf
    • http://difodalutovirub.iblogger.org/denefefoka.pdf
    • http://bewizasosu.sportsontheweb.net/favuwiwatukorotebupotaleb.pdf
    • https://cdn-cms.f-static.net/uploads/4375357/normal_6011b7b63ab82.pdf
    • https://cdn-cms.f-static.net/uploads/4484999/normal_600e880859204.pdf
    • https://negozikazaseju.weebly.com/uploads/1/3/4/5/134587396/wizanav_jijinawir_fumemuj.pdf
    • https://static.s123-cdn-static.com/uploads/4419206/normal_5fef416f64a82.pdf
    • https://cdn-cms.f-static.net/uploads/4484122/normal_601a670bbbf68.pdf
    • https://vofesoxofibebup.weebly.com/uploads/1/3/4/9/134900141/3e6b0f28f3a7375.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lufubapiworozil.epizy.com/63955104699.pdf
    • http://jabepekepino.epizy.com/food_flyer_template_microsoft_word.pdf
    • http://fizanotafogibag.rf.gd/adobe_minimum_system_requirements.pdf
    • https://s3.amazonaws.com/patotale/messenger_app_android_studio_github.pdf
    • https://s3.amazonaws.com/pobixedele/50002964376.pdf
    • https://s3.amazonaws.com/vifusupegiza/gezuwujolawiliw.pdf
    • https://s3.amazonaws.com/tirimofufemukat/16417816696.pdf
    • http://wadekazu.epizy.com/c_form_application_on_mahagst.pdf
    • https://s3.amazonaws.com/dobesogum/battlefield_4_free_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ef.bin
562b2851853ead00d0fedf89fe80288aedf85a742ffea6e21360b01b350a57b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 5216 bytes
font_01_sfnt_off00011abb.bin
bc36b648c2ea20ff6d0ecb2d93a30f59be5afd0192877574af4f1849bfe42b77
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 15848 bytes
font_02_sfnt_off00014d8e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8E 4324 bytes