Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dede164a98d58fe…

MALICIOUS

PDF

96.6 KB Created: 2021-03-23 14:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b2fc76a1845e27a72a24438461168c73 SHA-1: a3f81b1073e64d7edd99f3936b6a38fdc3147a39 SHA-256: 5dede164a98d58fe003de10fa1ca616ce6a96c90670ab7bf8a181114facad244
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and directing users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and the presence of a suspicious URL 'https://pelibifir.ru/award?keyword=baba+balak+nath+ji+aarti+pdf' strongly indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=baba+balak+nath+ji+aarti+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481069/normal_60595dae3d99e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453563/normal_5fc6b0fd2d32f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5fc8c85ccaae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_602498f3b6e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5fd146a3eb72a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527747/normal_603b14aad9ff8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/difference_between_dashboard_and_report_in_cognos.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_7691655794da41d8aef8c0281397cc3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced2b03d-8715-4944-a431-40d9ec07900c/simplifying_square_roots_worksheet_answers_with_work.pdfIn PDF document text
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_56bcf3c263244caf86cdd7f2ba621f06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/jejowikema.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/77841651697.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/zomobajukigaruvemimim.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/water_soluble_vitamins_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7217b292-dfba-4007-be73-852be37f7e11/python_list_remove_element_by_index.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/76435869335.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/tatogijetopulurusudukebuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c719ed1-0dab-47df-86e9-620b96df650a/where_are_the_most_colombians_in_the_us.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4A 5280 bytes
SHA-256: 8907f7ceef36c042d86113bfc207df2da0a86e71cf977b9317bcb7ee0d4ca980
font_01_sfnt_off00015137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15137 11004 bytes
SHA-256: ee4c7b0f51622e792b4f7c4584830ba609eaf446e5d3362eea43f3b29e28a758

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