Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2857bab87716cf…

MALICIOUS

PDF

60.4 KB Created: 2020-11-19 23:57:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 696d615ec72d24e7c897e682c0fb8d2d SHA-1: c810ebae493cd4b812cae72d5d255f866bfc841e SHA-256: cd2857bab87716cf289beb9f1a3ca4264d923310ad48f6579808ccf02fbc3c02
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one example being https://uploads.strikinglycdn.com/files/1e96d124-47b1-4c27-ab7c-b63de5ed4ebe/bio_medical_waste_management_2018.pdf. The primary external URI found is https://traffine.ru/123?utm_term=billye+brim+books+pdf. The document body is heavily obfuscated and appears to contain metadata related to its creation, but no clear instructions or lures are discernible from the readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=billye+brim+books+pdf
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/papefokimofuje.pdf
    • https://fufirixosidewo.weebly.com/uploads/1/3/4/8/134868093/1f5361be.pdf
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5f9cc1009243a.pdf
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/tobikowixe.pdf
    • https://wiwusazefaxowo.weebly.com/uploads/1/3/4/4/134457051/relusoruguguzuponu.pdf
    • https://cdn-cms.f-static.net/uploads/4502436/normal_5faeb721d0eca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1e96d124-47b1-4c27-ab7c-b63de5ed4ebe/bio_medical_waste_management_2018.pdf
    • https://s3.amazonaws.com/fasanag/nupimofowova.pdf
    • https://s3.amazonaws.com/memul/pimupigi.pdf
    • https://s3.amazonaws.com/marimejerebo/kemakigavuxikitonogu.pdf
    • https://uploads.strikinglycdn.com/files/215e3c1f-7092-414b-9149-d746c40db7e7/n_thng_nhn_chu_doanh_wiki.pdf
    • https://s3.amazonaws.com/gotenukevepunin/irs_forms_ss_benefits_worksheet.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b053.bin
7fb6942d86f7f1a4d8de604e08077d3b757c87064dc6bafac2bd794c5088bbc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB053 5332 bytes
font_01_sfnt_off0000c26a.bin
a62883c3b86e191b103384f7fd2e7032ef7ad795d0ae11e87c5d657230f0b596
pdf-font-stream PDF embedded font (sfnt) at offset 0xC26A 10508 bytes