Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02ade8e5ba13c40…

MALICIOUS

PDF

125.6 KB Created: 2021-03-17 08:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01c5775f86cd23a2399a0a7826f1b878 SHA-1: 1106df085886eca91fc8cf81ca90237f9cbb40bc SHA-256: b02ade8e5ba13c40c25dafab1102b67974c4c1ccacb9810ddae2affe6997acfb
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 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=seoul+metro+subway+map+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496584/normal_6037af0a27db5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_603a201de26aa.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/ielts_practice_test_writing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467576/normal_5fe315a0d49bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5ff1075673e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_600f0d51ba5dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387825/normal_6004b77deaf86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470017/normal_600524319720c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_604702b54bec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392472/normal_6035bd6a51664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366015/normal_5fe33217b60f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/bujemoxamalazoti.pdfIn PDF document text
    • http://numilovazafutet.rf.gd/enfermera_bronnie_ware_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a0ba63-c793-47a1-b22f-d8747be37da3/lopiriwusifagunowodewa.pdfIn PDF document text
    • http://lirifamagugo.rf.gd/68155127837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a03afaa-e91d-4686-acab-c5cf44e1c7d4/como_calcular_molaridad_a_partir_de_ph.pdfIn PDF document text
    • http://gesulobanaxa.rf.gd/single_man_outrigger_canoe_for_sale.pdfIn PDF document text
    • http://vimagilapanagon.epizy.com/bevogusavojufulavas.pdfIn PDF document text
    • http://gamukudolaxe.epizy.com/babette_s_feast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ed1e0e-7d9e-4d84-87c5-692ba0ce8792/10001127751.pdfIn PDF document text
    • http://menolepeduvire.rf.gd/22985035368.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/compound_nouns_worksheets_for_grade_5_with_answers.pdfIn PDF document text
    • http://ralenosozizog.epizy.com/laturufukogetomezox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e750a0d-2113-4fa9-be5d-56c2a8ced570/mifaxurixawebefij.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_off00014612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14612 36760 bytes
SHA-256: 69291691c7d518b2d53ae6c255b680ab075b22b0a7fe87c37020c8066872ea09
font_01_sfnt_off0001adee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADEE 5624 bytes
SHA-256: 6a602b7c2b37b17d8f7a7452edaf5016fa73d7e7e61d5397139f7b5bd580a07b
font_02_sfnt_off0001c106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C106 11436 bytes
SHA-256: 0164e6a143ed6a3d2fe3b17b47e4f9752547cb8b414ca34d3c7d5a757afcf5e2

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