Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9e3ac41dab161e…

MALICIOUS

PDF

70.2 KB Created: 2021-02-15 22:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a400ac7153deab5307cfcfefe7983f0b SHA-1: 9668efdcb563d34b9673de1b26982d0c2a157d8e SHA-256: 1a9e3ac41dab161e2546778f84fb93a147bd8b9ef369f83099e00f5343c3592c
126 Risk Score

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 0.9997

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/wix?keyword=tv+satelital+gratis+amazonas+2019 PDF link annotation
    • http://wrinklestiltskin.com/wudagogalefarepogudodidsd8l3.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/wozenifenopabup_bulabe_jezogazivodaf.pdfIn PDF document text
    • http://guwejusu.22web.org/conjugation_of_regular_verbs_in_spanish_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/0SjejiZ/nickelodeon_kart_racers_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/Ejbjfhc/graphic_design_portfolio_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/hicge1L/19348868489.pdfIn PDF document text
    • https://bileravufal.weebly.com/uploads/1/3/4/7/134749654/aa49ffc6a74acf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xalimelipuv.rf.gd/juleralinukojonuwubi.pdfIn PDF document text
    • http://muwiliwus.epizy.com/choir_guy_sebastian_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/81595074008.pdfIn PDF document text
    • http://vavikanepib.rf.gd/docker_alpine_apk_add_proxy.pdfIn PDF document text
    • http://wemazepiba.epizy.com/cabin_crew_training_course.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 5548 bytes
SHA-256: d2b3c109c8843a48a1e0a2a6c997ea17ecd17811e721cc0261b12b719fc169f5
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 14820 bytes
SHA-256: 44e04ea5881d1042915b98fa2cfb41f8ae9be961bb89210c3ad92808df50998f

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