Malicious PDF — malware analysis report

Static analysis result for SHA-256 4082858c469e6b01…

MALICIOUS

PDF

68.0 KB Created: 2021-03-23 17:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6195e1a97c5260d0ecec0590048a1ef5 SHA-1: 92f117366b4ad09100e9add144fa83c752b96134 SHA-256: 4082858c469e6b011722bc80b7e53aba23c47f88578b5af95fcde2ad18c3fbd8
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs. The embedded URL `https://mezovuduw.ru/wix?keyword=unidad+1+como+eres+answers` is likely used to redirect the user to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and the presence of malicious URLs suggest an attempt to exploit users through a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=unidad+1+como+eres+answers
    • http://tehnikator.ru/57228315934j0jnd.pdf
    • http://mevukavotidu.getenjoyment.net/kaviporinamanijozun.pdf
    • http://ulekschool.online/litormom60.pdf
    • https://cdn-cms.f-static.net/uploads/4486356/normal_600ff394e9ce2.pdf
    • https://cdn-cms.f-static.net/uploads/4393647/normal_6056d4573ec72.pdf
    • http://tigibisolefora.mygamesonline.org/how_to_open_a_zip_file_in_garageband.pdf
    • https://cdn-cms.f-static.net/uploads/4469116/normal_6015d851c88e0.pdf
    • http://waliduv.mypressonline.com/pathfinder_bestiary_box_1.pdf
    • http://jijuduli.mywebcommunity.org/52479976124.pdf
    • https://static.s123-cdn-static.com/uploads/4376610/normal_5fe426824f472.pdf
    • http://nasty666.space/membrane_structure_and_function_answer_keyj1t7e.pdf
    • https://cdn-cms.f-static.net/uploads/4426407/normal_60162026c7421.pdf
    • http://dedosesegawiv.22web.org/grammar_exercises_printable.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedojigudaj/nj_common_core_standards_math_kindergarten.pdf
    • https://s3.amazonaws.com/pujinit/dedareleponufopeba.pdf
    • http://vukirulavobos.epizy.com/53870926056.pdf
    • https://s3.amazonaws.com/bomupi/app_store_link.pdf
    • http://nazowovemozugiv.myartsonline.com/wibakeduvimowiwolujozim.pdf
    • https://s3.amazonaws.com/wewuxuviwar/historical_places_of_assam.pdf
    • https://s3.amazonaws.com/wazotojemov/22677957032.pdf
    • https://s3.amazonaws.com/diwitapezu/61509917862.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_off0000cac6.bin
42b1db6f3dee08ee0573127c294721c8ce4ef78ef244c2c06b64828dcd3b2d48
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC6 5188 bytes
font_01_sfnt_off0000dc6d.bin
f35e5ce9acf77e44b6b6c2f15eb2525bf583e42a051a8fb69afd9efe90417efc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 11784 bytes