Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bba5d3a1ba444ee…

MALICIOUS

PDF

77.3 KB Created: 2021-05-11 20:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 79a5acb9c3b3cff20d414dba84ccaef0 SHA-1: 210579acfda956e60dc0657858bde9b6b73b6a51 SHA-256: 0bba5d3a1ba444ee016397d61d2ffd77e52d9b019aa73e50889516bbea702a37
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru', suggesting a redirection to a malicious site. The document body, though heavily obfuscated, contains keywords related to factoring polynomials, likely serving as a lure. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=factoring+polynomials+by+grouping+khan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416659/normal_60336510b5054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_60459d7a05414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5fccb657c1d8b.pdfIn PDF document text
    • http://amsidgi.xyz/formulierungen_fr_charakterisierung_englische42kr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481270/normal_5fe2311ca88f1.pdfIn PDF document text
    • http://shopwithsale.website/36934343016o0wz3.pdfIn PDF document text
    • http://eushopvmn.site/tissot_touch_1853_setting_timemvkk8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_600e047c8a8f1.pdfIn PDF document text
    • http://lidlid.xyz/1862340772xhn90.pdfIn PDF document text
    • http://stickerrus.ru/management_by_objectives_process_mcqbg3ti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_601445427e4ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_5ffe8fb893360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_605c08a33ace7.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.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/widofafane/1632201583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084823fe-f780-48af-9847-00b0618f9d19/lazosujujemulemip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e4a4fb-17ae-469c-ae46-f305af60f900/xuxexobekom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e61443f-1c27-490d-9630-271c6fa81a3f/82176308927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe53c893-e938-4025-9544-f885eb3aae8c/blue_iris_flower_glendale_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/rosumim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ba3c6a-f0b8-4dd0-93ea-bf15b1b277d9/jesirudobirobuxavugibi.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/how_to_use_woodworking_tools.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_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 5608 bytes
SHA-256: 8aa7ab5a488afa3c4bd122a8cfc34329643aa6bd7144ad1fc018de0165e07eb1
font_01_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 10468 bytes
SHA-256: 1b85b50054f122fca19428d842abf8c447d0b4aff70936352fbbe93c6b2b9685

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