Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2325196599c28e…

MALICIOUS

PDF

80.2 KB Created: 2021-05-23 14:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02b80883c25c27adfbed2d6e4b49a5db SHA-1: 168181d7f968501f011daf55e1cf209a7d556e7a SHA-256: cc2325196599c28e101c4c50f2419c3a8d19026eb6461e2e87125e1bbb46afee
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://kuzutuzo.ru/strik?utm_term=breville+smart+oven+pro+air+fryer+reviews', is directly linked to the document's content, suggesting a lure. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://kuzutuzo.ru/strik?utm_term=breville+smart+oven+pro+air+fryer+reviews
    • https://cdn-cms.f-static.net/uploads/4379987/normal_60183efa3d619.pdf
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fedcb1742542.pdf
    • https://cdn-cms.f-static.net/uploads/4495385/normal_600fa6e76f31e.pdf
    • https://cdn-cms.f-static.net/uploads/4412408/normal_602b7bf2a8d87.pdf
    • https://static.s123-cdn-static.com/uploads/4485451/normal_600586c8aded5.pdf
    • https://cdn-cms.f-static.net/uploads/4464068/normal_6064be2115cad.pdf
    • https://cdn-cms.f-static.net/uploads/4421049/normal_604ad31043c43.pdf
    • https://cdn-cms.f-static.net/uploads/4425010/normal_602b97eb557d7.pdf
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/tomukixir_zozavizifaf_rugezusuvob_nudafavebog.pdf
    • https://static.s123-cdn-static.com/uploads/4475196/normal_6001d27d9e5b8.pdf
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/e4cc8757acc7.pdf
    • https://tafedelimege.weebly.com/uploads/1/3/5/3/135345870/1412156.pdf
    • https://cdn-cms.f-static.net/uploads/4378827/normal_604f21150e6e8.pdf
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/5ec8efe5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7457a34f-0e69-4ce4-ba19-4813e98affca/how_many_social_workers_are_there.pdf
    • https://uploads.strikinglycdn.com/files/cc1a1f1c-608d-47ec-8be7-be248e70ab4b/tonurolemi.pdf
    • https://uploads.strikinglycdn.com/files/80516f61-a109-4c05-b0f0-bb65b7c0b560/arfken_mathematical_methods_for_physicists_5th_edition_solutions_manual.pdf
    • https://uploads.strikinglycdn.com/files/d67ba520-e547-41c6-86e5-ec4c2a6ddc93/how_to_make_residual_income_uk.pdf
    • https://uploads.strikinglycdn.com/files/02b1afb0-c88f-4ac3-9dfe-385431b33add/19947871256.pdf
    • https://uploads.strikinglycdn.com/files/7c3bf514-d834-4b5e-8399-18ea7a3918f8/sorixot.pdf
    • https://uploads.strikinglycdn.com/files/8df3e43b-3553-40d2-ac2d-d9b428126b82/osha_10_hour_construction_industry_outreach.pdf
    • https://uploads.strikinglycdn.com/files/105a255d-35b8-433b-8204-3f6136bbb957/warhammer_40k_9th_edition_rulebook_price.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_off0000fbeb.bin
6784c7eccd9d60dd17bdcc436fa300391dbe830bf036f9a163e0cc7ed2e23322
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 5352 bytes
font_01_sfnt_off00010e21.bin
99a8edfe32734310d4080bf7a55976b12e451c172ec153ed131680839e67815b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 10928 bytes