Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9cc97c81af2cee…

MALICIOUS

PDF

80.0 KB Created: 2021-04-02 07:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 03fb58d9b8e6e050d3f18ec9aab84b1e SHA-1: d69ec3fc8912f180357dc66dbdab5661d1e917b4 SHA-256: 8b9cc97c81af2ceefa455a59ada9ba0193a249738c0205e0679ae3c2ac9ab9c4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xajibur.ru/aws?utm_term=deputy+executive+director+unicef+salary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409840/normal_603ad6aadb65d.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/nesebibopemalotek.pdfIn PDF document text
    • https://ledatomonuv.weebly.com/uploads/1/3/4/6/134686063/vuwiresefavalafu.pdfIn PDF document text
    • http://sdek-24.cc/github_pull_request_review_best_practicesjh584.pdfIn PDF document text
    • http://apsmall.space/1469529294o73cj.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/zumanesirejo-dutevanagored-zosud-degifaxo.pdfIn PDF document text
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/towajo.pdfIn PDF document text
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/pemol.pdfIn PDF document text
    • https://vunivejo.weebly.com/uploads/1/3/4/2/134266425/05b4f50d17f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_600ca78f5535a.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/funulibasajo.pdfIn PDF document text
    • https://xilexuluta.weebly.com/uploads/1/3/6/0/136094269/wexifugirolexajik.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/5e8a0a9b-458d-462e-9129-ddf86a4b18a2/62195964545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb603774-c167-4365-b5c3-2e9b2f463d83/tcap_practice_test_8th_grade_science_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17469c29-0bb3-4b91-b9ff-513ec2fd214f/69045913751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62b1ff3-4da0-4681-a6af-5df78cf95d33/aa_and_na_meetings_on_zoom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfbf1c6-14aa-4282-a5ec-c1d952e025d1/variable_star_finder_charts.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_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 5260 bytes
SHA-256: c60c2a0ffa0281cdcad420d1c6c64610f746723a16b6e2170d9c3de9e734e248
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 11484 bytes
SHA-256: bbc048c95708769785aeee383612a68cdd7cd2a8459a1b901966efb6a1289b4f
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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