Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2080dc59ec07cf…

MALICIOUS

PDF

98.7 KB Created: 2021-04-07 19:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fceb06b20224d110466b830dfe765261 SHA-1: ba5700e6f6326cfda21fb703bba6aae644234f47 SHA-256: 8a2080dc59ec07cfa65350ae2f0e952b27b12b9c628066e8768e827aba35f62d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ponafet.ru/award?keyword=bingo+template+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490930/normal_5fda80c2dd5c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389370/normal_6009246ac88e4.pdfIn PDF document text
    • https://xejuxomezul.weebly.com/uploads/1/3/1/6/131637030/716bef373627ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_605076e27be98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376358/normal_60086c7c23831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fe2b9b26ebc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450434/normal_5fd9022edaa6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_5fcc2aad3c1d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_603e89e65d123.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5fe0e0a354f68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_600635a03d1a6.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/figazovak-rabolajujarilek-vevolo-kenikid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5ff6358edbac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_604f6f3a1c485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_601855ba251ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_5fd93559130a4.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/3d862c88-9ccf-4b3a-beff-f72f0912bf37/security_analysis_and_portfolio_management_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561f65c4-79d2-4992-ad54-871340d36b7d/60434372420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70751743-8c7a-4f20-8524-21b15fcf71de/89250252292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71fcf5f3-6c1a-4ef9-b74d-bd7a7c1896bc/the_history_of_sexuality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c06b0f-8356-462c-bf34-4e3fe5e1e19e/plato_republic_summary_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba09586-af6d-4a84-b0fa-08ea6f80cb4f/25409270925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4565b3f0-9209-48c0-804c-c8c4a2d2a1da/what_to_eat_on_bright_line_eating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7785204a-8428-4d67-8db8-8a8c9938b0ca/friction_practice_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee7cfaa-51ca-493a-b559-aeaf679988eb/dodogilunali.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_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 13812 bytes
SHA-256: f9f4de7d662a267c2ddf782b31f0b04c9952f39f216942029c3d307284eb2dca
font_01_sfnt_off00013803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13803 5232 bytes
SHA-256: 8ad093b1375fc73ced3a0777db319c4b100afaf7c324d63f5a5a5ca07db3bf5c
font_02_sfnt_off000149bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BF 18512 bytes
SHA-256: cfa2a5cbc5ead0710b559ba871be7a57b6a873eba96b7755086b4b599b505523