Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e15cf6cf20ba35a…

MALICIOUS

PDF

77.3 KB Created: 2021-01-19 15:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4c24feee754a03fc1393dc25d3a9ee1c SHA-1: 791dff39bb8fff018cc3e5bf95e2c07a58715f42 SHA-256: 3e15cf6cf20ba35a6c327a845e69af30c707a014c1829fd9bab3eaa530455b5c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with one heuristic identifying it as a 'PDF_SEO_LINK_FARM'. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution. The document body is heavily corrupted, preventing analysis of its content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/123?utm_term=ddl+vs+dml+in+sql PDF link annotation
    • https://gukijofajileraw.weebly.com/uploads/1/3/4/3/134392650/3293014.pdfIn PDF document text
    • https://xofujudafovebe.weebly.com/uploads/1/3/1/4/131410434/48783.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/68785f90.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/java_installer_failed_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/ZFibYhh/mod_master_for_minecraft_pe_apk_uptodown.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/nepugokati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/yo_whatsapp_2019_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/zatagixosesekiw.pdfIn PDF document text
    • http://nibudikugi.epizy.com/8941988314.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/33481154083.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/41850621764.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/non_disclosure_agreement_real_estate_template.pdfIn PDF document text
    • http://dawutanarav.epizy.com/affirmations_for_self_love.pdfIn PDF document text
    • http://nozaleb.rf.gd/2725396458.pdfIn PDF document text
    • http://wolaniloko.epizy.com/disney_lullabies_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/45840420913.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 4328 bytes
SHA-256: cc3792cde042601edd4bf7a11380ea618892d66c7f9e909f2a6e12cb4131bc97
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 10404 bytes
SHA-256: 7ce900bac44b9c07560d24faab98eec753568366b4e9e30533b92a0954583cfd
font_02_sfnt_off000118db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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