Malicious PDF — malware analysis report

Static analysis result for SHA-256 0590899c5cf0fa07…

MALICIOUS

PDF

101.4 KB Created: 2021-03-10 09:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b2249e29682e6f325a431a1929b061e SHA-1: 82e65a89525e345264748b6420490b7638ac01b8 SHA-256: 0590899c5cf0fa078971f96e6c13c31586f4bc1fe79a64def0eb7828feeb0f14
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-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://maypoin.ru/123?utm_term=all+transformers+beast+wars+characters PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5fe5c77995fea.pdfIn PDF document text
    • http://mybatut.store/how_much_does_before_the_90_days_pay8046w.pdfIn PDF document text
    • http://madusotiju.22web.org/is_it_worth_investing_in_pink_diamonds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487206/normal_5fdda61d3f9ac.pdfIn PDF document text
    • http://reestr.site/8089483781axkie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_6014c14882f68.pdfIn PDF document text
    • http://topmassage.net/7458195359mjima.pdfIn PDF document text
    • http://mikapamaku.22web.org/5304548315.pdfIn PDF document text
    • http://vawuxipofuf.iblogger.org/reported_speech_in_spanish.pdfIn PDF document text
    • http://bowojimiwa.22web.org/opera_browser_with_free_vpn_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_60179ca9c67b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9822b4d-f18a-4e05-9371-a0d1dc85a8ee/tipos_de_comunicaciones_escritas.pdfIn PDF document text
    • http://koxaxinum.epizy.com/baldi_vs_granny_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa445199-c8bc-4f87-acd4-df1727046c9e/calories_in_el_pollo_loco_flour_tortilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67391809-226f-4224-8e1e-9d32dd7876bd/jebegir.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/karomoliwemusonosamofelot.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/genetica_de_la_anemia_falciforme.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/sogasirafavipusogarama.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_off0001504a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504A 5344 bytes
SHA-256: 59bdc45ed77116177130955a8a1685185080fffdef77392eef1227d2af43b433
font_01_sfnt_off0001625a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1625A 11096 bytes
SHA-256: d385082991e89ce31a9ebe2bcf395bf32c5f8863e562000dfc94d96142dc608c

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