Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa4fd24dc608058…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 11:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: de597592f9303d4357924acbc8460058 SHA-1: 558978fa74f7975a4a0c852f9e90b698970f37c8 SHA-256: 3fa4fd24dc608058a0e4b54686a17a2e2b6f79cbc6f54976bba7afc3cfaeacf1
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://druttle.ru/award?keyword=candidiasis+cronica+tratamiento+farmacologico+pdf PDF link annotation
    • http://complect-tech.ru/11703975747d7xwd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_606108ca334a4.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/nuparevijeviw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443371/normal_5ff829447a3d8.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/femugivolidelulorub.pdfIn PDF document text
    • http://bonboxstudio.com/1350130326g82ob.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/paulk_workbench_plansrugm2.pdfIn PDF document text
    • https://tuxemadoja.weebly.com/uploads/1/3/2/7/132712185/rapop-fufekojogijaxiv-xowife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_604b63a9989e0.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/wanepame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fd03968d664d.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/futifiwogopexunejejilobuk.pdfIn PDF document text
    • https://nogusuxewi.weebly.com/uploads/1/3/1/4/131438155/72aea62607c6c7d.pdfIn PDF document text
    • https://rifuvosibimav.weebly.com/uploads/1/3/5/3/135383082/kiduxidujefavagija.pdfIn PDF document text
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/a4b11bcbd1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482625/normal_5fdb9d4596279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapewujekim.epizy.com/87531815946.pdfIn PDF document text
    • http://rugezibeze.rf.gd/xarogebizisire.pdfIn PDF document text
    • http://kugogawi.rf.gd/gusenenis.pdfIn PDF document text
    • http://verofibigo.epizy.com/mississippi_drivers_license_book.pdfIn PDF document text
    • http://luwemazezabubat.rf.gd/telugu_movies_free_jio_rockers.pdfIn PDF document text
    • http://gomaxuxibofetap.epizy.com/descargar_manga_berserk_gratis.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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 5380 bytes
SHA-256: 6ec926115d35130b154d2de4f263c756f09062ee64de376720d9d932733966e3
font_01_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 11156 bytes
SHA-256: 8b16469548c6f36cd039c0680d78500497706341695cf5249d63cff5395568e0

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