Malicious PDF — malware analysis report

Static analysis result for SHA-256 f685a168406f4ad2…

MALICIOUS

PDF

73.1 KB Created: 2021-03-25 00:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 03b17f32b358ae9012847846fcff48ac SHA-1: b0339e07d619bcebd136dd8677cc058247370646 SHA-256: f685a168406f4ad2763a4a138588c149aba73da9ab6e0dbaf7022bbe9f5c6c9e
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/wix?keyword=egg+drop+project+calculations PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487386/normal_5fefbb46f0c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5fda9067f3910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466364/normal_5ff8f3b34e21d.pdfIn PDF document text
    • http://zivasajotafu.iblogger.org/thomas_calculus_10th_edition_solution_manual.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/appsc_group_2_syllabus_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/euC5NlY/jupejuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_601b7b8a83dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529149/normal_60152ce5c64d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_6033e9f5b1cac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479223/normal_5fcc29af93c48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368978/normal_5fe05e76df0f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_603da615d7f9f.pdfIn PDF document text
    • http://nezatarofarix.getenjoyment.net/ssc_stenographer_exam_papers.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/igfhjhb/japan_claw_machine_jcm_real_crane_game_app.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
    • http://xebowuruno.epizy.com/fuzoz.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_a178615ba06b421cba45ce967ba97eb0.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_b9a12f3283bb4b70a8be03f97e1131ed.pdf?index=trueIn 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_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 5156 bytes
SHA-256: 1095edd17f47583bbaeb8cea509b2178a7b93de9ea97cda3e50fbfaca2e40755
font_01_sfnt_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 11044 bytes
SHA-256: 47d5e903ad72c3b9e3b49c80f2d7fc28d7ef1664ff7607c31d5f4f82753c9a71
font_02_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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