Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a9b3da68ed64f8…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 17:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ffe05c4a5176b82dc61481275404196e SHA-1: 59c67648d65d5914ba22b478c05d553080aa01db SHA-256: 28a9b3da68ed64f847746d73982091dcafc2a580fbf01168fba148d74bd06f37
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 0.9996

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://soxebez.ru/123?utm_term=bright+colored+semi+formal+dresses PDF link annotation
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/xoxukimorukogorava.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/tum_kab_jaoge_atithi_answers.pdfIn PDF document text
    • https://wipowoniwosixad.weebly.com/uploads/1/3/0/7/130740259/wotolamorumujo.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/bjihegi/digital_middle_school_books_with_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/heYicpy/pezikikinedutivumate.pdfIn PDF document text
    • https://kodusikur.weebly.com/uploads/1/3/1/6/131606179/saretaxomubuleg-kimib.pdfIn PDF document text
    • https://xelavizagak.weebly.com/uploads/1/3/5/3/135325118/17187.pdfIn PDF document text
    • http://devgame.design/ravupozotilulshsx9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_6027471b393ca.pdfIn PDF document text
    • http://want-seo.ru/melubiwaxazalo9rcd.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/notasuji-jejoto-rewibasateri-tawobanadideni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5ffc9dbf05c5c.pdfIn PDF document text
    • http://lngcliente.com/77170850068pmi3f.pdfIn PDF document text
    • http://nesobaka3.xyz/1056326361322qfo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_60434c8cc7ae4.pdfIn PDF document text
    • http://gosofejabe.iblogger.org/printable_party_invitations_templates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_6008cdc91bb7d.pdfIn PDF document text
    • https://cdn.sqhk.co/lofopapenow/RVqY0H4/89339455014.pdfIn PDF document text
    • http://uablog.site/49018034215mm3mq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418171/normal_5feb7704b71ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_603e8837c115e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuvonuj.epizy.com/kojasabaputumozi.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_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 5484 bytes
SHA-256: 789fb971cc2ad789214c249efb11ebdb72f2173163b525aa69abcb02c5b68edd
font_01_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 11112 bytes
SHA-256: 06db9adde3da2e6728dcedc2f78dad12022da8433b736dc63d6a4a7834093312

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