Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23515106c314645…

MALICIOUS

PDF

66.7 KB Created: 2021-03-29 19:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a04a04fd1d62a5d537cb3a43ccfa8c2 SHA-1: d4deeae1e8132408179cdca711199d8bcde90f7b SHA-256: a23515106c314645ea2087b1ff69eb2f80f36f17151fbae1408dad790acd89f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://gimoguvi.ru/wix?keyword=graphical+analysis+worksheet+answers PDF link annotation
    • http://websporizle4.com/your_perfect_right_a_guide_to_assertive_behaviorob5tw.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/2027541.pdfIn PDF document text
    • https://cdn.sqhk.co/nefikelifu/jgtPjjv/biodata_format_for_students.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/valunaratup.pdfIn PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/df57714f9638.pdfIn PDF document text
    • http://zusetuwegu.22web.org/sofia_the_princess_game.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/alkylation_unit.pdfIn PDF document text
    • http://discount50.pro/69280839368cnb6x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_604221f141388.pdfIn PDF document text
    • http://questotzvezd.space/wutusegugapidomibezobaie18g.pdfIn PDF document text
    • https://ragaxunuwad.weebly.com/uploads/1/3/1/4/131407405/6890762.pdfIn PDF document text
    • http://damvglaz1.xyz/neonatal_sepsis_guidelines_2019_aapm58bn.pdfIn PDF document text
    • http://ijmalan.xyz/eminem_toy_soldiers_mp3_downloadk32bn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_604934c883b0a.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/Wp3nihY/34243200414.pdfIn PDF document text
    • http://fazoluniguket.iblogger.org/pcr_test_for_hiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404116/normal_5fe0230c9d92c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenezipulugiji.atwebpages.com/29753959170.pdfIn PDF document text
    • http://jaweratiz.atwebpages.com/high_cholesterol_foods_to_avoid.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_off0000ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 5312 bytes
SHA-256: dbd7e257c0af1ddbc50b81f1ffd38b81b20f43d9380f499db732b000763ee79f
font_01_sfnt_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 9816 bytes
SHA-256: 776a691beb3559e8045ddeb751cada4d646ae121197326af556785ad866e163f