Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33a74011079107e…

MALICIOUS

PDF

78.4 KB Created: 2021-03-09 19:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f1d02f61d27f642e7beda25909a655e6 SHA-1: 98f03282670382b35cddbd0831869d33fa262069 SHA-256: b33a74011079107ed081435e965ae260804f0b5069277874e764bd1c0ad8e9d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://xajibur.ru/aws?utm_term=free+carpentry+books+online PDF link annotation
    • http://belplitka.ru/calendar_template_2019_uki0dtz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_6019887ab5c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_603068b006355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fc88db52b05d.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/36134053625.pdfIn PDF document text
    • http://ximitufuzobilan.iblogger.org/34817472851.pdfIn PDF document text
    • http://healthyforczechrepublic.site/quimica_organica_resumo_descomplicas382p.pdfIn PDF document text
    • http://dabosesavedevet.medianewsonline.com/jiwosesixuteravofep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450354/normal_5feeb68f8011c.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/three_capital_budgeting_methods.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459785/normal_60080a199447c.pdfIn PDF document text
    • http://bilkan.fun/suvixusobafodobosimaditzks9.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://nulabede.epizy.com/52152513889.pdfIn PDF document text
    • http://jagutebi.epizy.com/dabupuxabixe.pdfIn PDF document text
    • http://fabomisibis.rf.gd/uc_browser_2018_new_version.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 4976 bytes
SHA-256: cd0b7df29894a097c486c6677a9ca7accabcd746ae5b398bd281906cbcb4506c
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 11116 bytes
SHA-256: 181a4bef5435e86b1689c8299e1a2ce9d94b8cee2c339099dac6735e2d7a1688
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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