Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc0714ef4e80c60…

MALICIOUS

PDF

70.7 KB Created: 2021-04-02 16:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1e81beeb3e08c3b35d76900d80db4a4a SHA-1: 10424a91092e2a5dc7e1bcc80f33f8c7bc7afef1 SHA-256: 5bc0714ef4e80c60a76ba61284f9a7c8350acfc7712384d9339aceb65de506fd
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 0.9993

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://jacksth.ru/award?keyword=cambridge+primary+science+learner+s+book+2+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5ff7676bbf9e9.pdfIn PDF document text
    • https://luxabilep.weebly.com/uploads/1/3/0/8/130873941/zoreperoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_603aa9b7c4fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_606250138fd60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487409/normal_600b546935fee.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/B0gehbA/dinosaur_ultimate_battle_simulator_2_mod_apk.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/bible_study_book_of_ephesians.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/6737537.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/kezobobagawavalus.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/918158.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/neigijj/50738756996.pdfIn PDF document text
    • https://dobabolomibela.weebly.com/uploads/1/3/2/6/132681713/jugasofomar-garawazij-gufabobixezomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5fdb86276ef05.pdfIn PDF document text
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/40d936ece3e.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/gcmgn7E/80705645047.pdfIn PDF document text
    • https://latufuxi.weebly.com/uploads/1/3/1/1/131163666/liwuriwexe.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/lebavu_tewiwulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirofapinowud.atwebpages.com/calendario_mensile_giugno_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/16041793241.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/93373299708.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/sasemepejedasakux.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/how_to_install_a_toto_washlet.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/national_budget_meaning.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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 5816 bytes
SHA-256: 00f49f9a319178602a0892154d51f4a2d64c710c6926fc47cbf12c807d55c539
font_01_sfnt_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 10352 bytes
SHA-256: 43e353fcf882201788f779f3306c4c384bc85a403407c1564d0ee50539a9029b

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