Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3bcad6def489aa…

MALICIOUS

PDF

84.0 KB Created: 2021-03-25 00:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bb32f71b468dc6783f955872cbeb64bb SHA-1: b1a12ae55bf1652a63d79ec75e45c7bf8cbb9ae1 SHA-256: 4f3bcad6def489aa381dc66827c75fd43f23af99058312a16277d6679e172331
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://leonvi.ru/strik?utm_term=hp+officejet+pro+8600+cartridge+replacement+instructions PDF link annotation
    • http://bagerisevi.scienceontheweb.net/free_barbie_coloring_pages.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/35010364973.pdfIn PDF document text
    • http://logmeinnow.xyz/840438787900pvup.pdfIn PDF document text
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/senojakudogu-rikene.pdfIn PDF document text
    • http://santecmb-sarl.com/4457673617fdw1g.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/11038049986.pdfIn PDF document text
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/7257fc.pdfIn PDF document text
    • http://copyrights-notices-helps.com/xibakijat34owd.pdfIn PDF document text
    • http://daziruwa.22web.org/1962291948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruvaseravijuged.rf.gd/elastic_collision_physics_classroom_answers.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_b795bf64cedf4f90b721ed742b469173.pdf?index=trueIn PDF document text
    • http://pafapijeneradab.rf.gd/26672417672.pdfIn PDF document text
    • http://kagokonutuvep.epizy.com/effects_of_stress_on_employee_performance.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_b58620293cc04ee08abc695563e383a6.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_8e0bd50e7f834573a06e39341fa308d2.pdf?index=trueIn PDF document text
    • http://gikisomu.epizy.com/9758358158.pdfIn PDF document text
    • http://guzovoda.rf.gd/free_download_english_to_tamil_dictionary.pdfIn PDF document text
    • http://furafep.onlinewebshop.net/zaselitaxiduzov.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_3dc9dbb72570459a87ac2930541483a3.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 6004 bytes
SHA-256: 5d52dcfbf8b6e77222bc23b1405d4bea373c0abbf8db3b777aab150b4cf0e104
font_01_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 11116 bytes
SHA-256: 426c4f4f1b8e2c5ffd2e785bb8def541d81b9d49feb5bd4818e5a773275dc30d

Open this report in the interactive analyzer, or submit your own file for analysis.