Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fcd7dbe50f3eaa…

MALICIOUS

PDF

71.8 KB Created: 2021-02-24 02:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a9c833f80dc2d2e2da48ac09f73fe5bc SHA-1: ae9c64e7eb92843a81710b1204a4db9d85edec68 SHA-256: 98fcd7dbe50f3eaa41019f14d5f796da56232c4f2d10f36d1077165e42b565f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, with several pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=how%20do%20you%20start%20a%20refutation%20sentence PDF link annotation
    • http://douchelabs.xyz/boson_x_free_mac6zy4k.pdfIn PDF document text
    • http://grampus-shop.com/951030909wkxol.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/jhehijh/fun_facts_you_could_say_about_yourself.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/ghiePhg/jatiwogefikor.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/amores_verdadeiros_telenovela_capitu7lgou.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/hheibEI/hill_climb_racing_2_online.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/popstar_pet_ghost_simulatorjlop4.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/gihgFz3/jixedomejumi.pdfIn PDF document text
    • http://legendbilisim.com/wemamifejevebonift63fs.pdfIn PDF document text
    • http://llloooodddd.space/instrumen_akreditasi_puskesmas_2018okjc2.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/Lkfgcha/2nd_grade_math_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/6292985774.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/oculus_pentacam_interpretation_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 5140 bytes
SHA-256: 925d219dbddbb1d8699a57c41ec915074bb59b426e1b7cccf49b77d2d6eeddc5
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 10012 bytes
SHA-256: 04873b5d25e2665e6280c91bf8ae871f0f12146b711c91986bf5d01e278bc33f

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