Malicious PDF — malware analysis report

Static analysis result for SHA-256 676dc21e073eee97…

MALICIOUS

PDF

76.3 KB Created: 2021-03-26 08:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e1d8b89d42006c518f40441cc87633e6 SHA-1: 7684a978bd50a74238a74d17f1c08379cddb85d6 SHA-256: 676dc21e073eee977164c7894a5728643d2ead4e1608bbe922d666560439e26b
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-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/award?keyword=inteligencia+multifocal+augusto+cury+pdf+espa%25C3%25B1ol PDF link annotation
    • https://letirunexogono.weebly.com/uploads/1/3/4/3/134315181/2749758.pdfIn PDF document text
    • http://xiparebawiviw.iblogger.org/2007_honda_shadow_vt1100_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_60266688a1961.pdfIn PDF document text
    • http://reduslim-siteofficial.site/60852983706rep7o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428334/normal_5ff9ef4452618.pdfIn PDF document text
    • http://securityverifiedservices.com/9750605430m4cz8.pdfIn PDF document text
    • http://kvrovk.xyz/82036533701n9ol9.pdfIn PDF document text
    • http://3203epworthcres.com/bhaja_govindam_lyrics_in_sanskrit7akaq.pdfIn PDF document text
    • https://wozepunelom.weebly.com/uploads/1/3/5/9/135993859/sizudagilikeluwaxel.pdfIn PDF document text
    • http://easterthjg.com/list_of_articles_conjunctions_and_prepositions4c5qk.pdfIn PDF document text
    • http://satanifefa.22web.org/android_device_os_distribution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_60363000520e3.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/mefajol-vajadefamik-numemololisojab-vigimakukapifib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5fd778272aba5.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/pukaridimupo/luletatobodog.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/87588475685.pdfIn PDF document text
    • http://vodupuginotipir.rf.gd/bejawowimadopemafogot.pdfIn PDF document text
    • http://xamunenefo.rf.gd/senuvogerewefidukodajejo.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/loxaxujixid.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 5728 bytes
SHA-256: 87b9b0a5d06836b7ed8a596f968836248f66ec1d652b2b236ea82687111e362c
font_01_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 11656 bytes
SHA-256: 0fa697fd50829affde88a299292a05f738c3e0c7647af712e4eda883fe6c0f0f

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