Malicious PDF — malware analysis report

Static analysis result for SHA-256 508d3ef84918e272…

MALICIOUS

PDF

79.2 KB Created: 2020-11-13 08:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1be252774e13f71241c6d506bfc03f0a SHA-1: 5fd71eaa81e11aa591e0f9a5d153abc6e8a23059 SHA-256: 508d3ef84918e27215af019dd8535479d0915a083b652575d5ce70edbdb0f213
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain ('trafficel.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or redirection scheme. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

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://trafficel.ru/aws?utm_term=bncc+ensino+infantil+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418013/normal_5fa93a14734b5.pdfIn PDF document text
    • https://pudisipilusive.weebly.com/uploads/1/3/4/5/134597375/gebupoxigad_tibamifoze_motitumakibixa_sejale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f90830db4194.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/davunos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5fa187bdaa8c0.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://uploads.strikinglycdn.com/files/2f14de2f-891c-423c-99fa-d27fa4a66a31/the_cuckoo_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206c8212-f2ef-420c-8150-e35942d110bb/41157665697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca86052-8cb0-463b-9ed6-93387459a403/69379692122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372ffce7-6cde-48f8-9a17-5bcb5a214f1e/nawuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7262a3ef-8517-45b0-a982-41e8c707aa20/48249644351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e98fb74-1089-4329-ac93-a8695de781ff/35077262895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4cf5d1-956b-4919-8b12-d22d080c298c/joxojajozowepoxeni.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_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 4888 bytes
SHA-256: f3b450769f9619c239039e65f9991752a0463e220b88aeb39c648f600e6d5291
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 10440 bytes
SHA-256: 1e3f856faa1aa56111705ab3e6c813c4c20336b52cd32042907b45caea9b29bc
font_02_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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