Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d91d0e2f506a109…

MALICIOUS

PDF

134.3 KB Created: 2021-03-21 00:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5e9ab997b6f38b2965a8b96269356b3 SHA-1: d171cb623619836167206cf173c9d5ac9f1d8daf SHA-256: 1d91d0e2f506a1097660da9d0fe657bb957422ab855e13a044fb093af3339fdd
196 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'mct bruteforce apk', reinforcing the lure to download potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=mct+bruteforce+apk
    • https://cdn-cms.f-static.net/uploads/4490250/normal_601f38a164104.pdf
    • http://kezijumedet.mypressonline.com/aggregate_functions_in_dbms.pdf
    • https://cdn-cms.f-static.net/uploads/4470967/normal_6035fc9fa7906.pdf
    • https://cdn-cms.f-static.net/uploads/4461509/normal_600fe974c06e1.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_602904f3abddd.pdf
    • https://cdn-cms.f-static.net/uploads/4413017/normal_602b567d6498b.pdf
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fe8258d25345.pdf
    • https://miwunukeje.weebly.com/uploads/1/3/4/5/134524605/xabuserireli_tuzogebagomo_rudarepexulav.pdf
    • https://cdn-cms.f-static.net/uploads/4497079/normal_6022aa1b2d852.pdf
    • https://static.s123-cdn-static.com/uploads/4460045/normal_5fc64158c0280.pdf
    • http://xefopuro.mypressonline.com/leave_and_license_agreement_format_in_marathi.pdf
    • https://xumusozopojuvuj.weebly.com/uploads/1/3/1/3/131398507/7d7aa3b.pdf
    • https://cdn-cms.f-static.net/uploads/4387586/normal_60523b2933f04.pdf
    • https://cdn-cms.f-static.net/uploads/4425737/normal_6035a246bd806.pdf
    • http://pupunorip.getenjoyment.net/50824743393.pdf
    • https://cdn-cms.f-static.net/uploads/4501965/normal_60225cd57c92d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/7ef54eac-1108-414f-9ea2-1cd46eb461fe/hunter_college_spring_break_2020.pdf
    • https://uploads.strikinglycdn.com/files/05c6cb06-c02b-47f8-a009-48fad86da657/elementary_korean_workbook_ebook.pdf
    • https://uploads.strikinglycdn.com/files/98d1080d-0f0c-47b4-bd35-9131c3dabd50/pajipufudufibogipamote.pdf
    • http://fotizojorirepel.onlinewebshop.net/14467008382.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016aeb.bin
80d90bab30bc85c1e93dd6821ef70a8efef675aebfc855272eaba261449d48e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEB 13012 bytes
font_01_sfnt_off000193e2.bin
cf9c0fbd1badfa0558957c2a9303e7d3291399465e8a29092db20e1b2703e6aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193E2 5008 bytes
font_02_sfnt_off0001a50d.bin
4e022bfe53df3c2db4db35a66500cf3c9898a57b9de9d5eeaea0696205187a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A50D 17756 bytes
font_03_sfnt_off0001db28.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB28 16204 bytes
font_04_sfnt_off0001f092.bin
ba80ee5f53559cfaab7d373f1ea85a03ef9f4867939af0af9c6e2e5802e43d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F092 6992 bytes

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