Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5306ef16708d97c…

MALICIOUS

PDF

73.8 KB Created: 2020-12-28 20:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c77561f5e6409e02fff2b6fd76cac80e SHA-1: ab3759910c92f34a41bfeb4f4eea2c46142075b3 SHA-256: b5306ef16708d97cb210b9c9e8499f684d953a0048111fc920b6639e491b99f2
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded URI pointing to 'traffnew.ru', which is highly suspicious. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a crafted lure. No scripts were extracted, but the presence of a malicious URI strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=little+alchemy+2+cheat+sheet+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fbfc3016ce96.pdfIn PDF document text
    • https://cdn.sqhk.co/vurelakixu/fggXhjU/nick_foles_contract_with_the_chicago_bears.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b77808-59b9-444b-8f58-6a9973a1d366/bmh_id_bmmsa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7e107b-e8b7-494f-95dd-ff25f618cab8/quantum_chemistry_2nd_edition_mcquar.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/93619941444.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/atlas_book_in_hindi_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/44722137184.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/sewesugipavafob.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/answer_hq_trivia.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_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 5460 bytes
SHA-256: a16c5cfe82026be018dce3f7b1276000dd51af72e11dfb5d6f146671fa9543ff
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 10620 bytes
SHA-256: c8480eedd791c4847b909603a2d0a9387b5b75b7854cbdfbf97543b0f9e74024