Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3c693554180fcc…

MALICIOUS

PDF

84.0 KB Created: 2021-02-27 21:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d6c1548bf1fa4d730fcd2e85b1b6ee1 SHA-1: 35b717065dacd5caedf5c4fab51fe72660753c4b SHA-256: cd3c693554180fcca575d120d7a5902affe0b0de7255ae5059c00962979e4a96
136 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains an embedded URI pointing to a suspicious domain, and the heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive. This suggests a multi-stage attack where the PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gimoguvi.ru/wb?keyword=escribe%20una%20definicion%20propia%20de%20aprendizaje%20basado%20en%20proyectos
    • http://pornbustyvids.com/planetary_gear_calculatoriukcs.pdf
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5fd787b98a1a1.pdf
    • https://static.s123-cdn-static.com/uploads/4387826/normal_6005f32296120.pdf
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5ff4fb9d7e3b2.pdf
    • http://ductsunlimitedins.com/23795217075p2nrr.pdf
    • https://static.s123-cdn-static.com/uploads/4393893/normal_5fca6ad984e4d.pdf
    • http://momsmall.space/african_languages_an_introductionlw8ca.pdf
    • http://ziponep.22web.org/microevolution_and_macroevolution_worksheet_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4389582/normal_603821203363a.pdf
    • http://sokadap.22web.org/81999444591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sosozodazu.epizy.com/chuck_e_cheese_report_card_coupons.pdf
    • http://mitudosukekunif.epizy.com/kadar_caruman_sip_2018.pdf
    • https://s3.amazonaws.com/forupokisip/sibubevewot.pdf
    • http://vutaxinasiva.epizy.com/xufirawobexegorugojeg.pdf
    • http://zapulozamatuwe.epizy.com/68381884904.pdf
    • http://fakexebubigej.rf.gd/consumer_reports_washer_dryer_combo.pdf
    • http://wadoromutisagar.myartsonline.com/49910032617.pdf
    • http://wutesejib.onlinewebshop.net/how_to_clean_a_riding_lawn_mower_carburetor_without_removing_it.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_off00010653.bin
f453251484837988a0456fe11e8097b37737c1d20283404e8346d06cb4fa89fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 5440 bytes
font_01_sfnt_off000118fc.bin
08bffe3f475109941c97c116a1e9b7a1f76b2d4140c7cfe6447f7a07fbf84730
pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 12056 bytes