Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c19ca7b3d7faa04…

MALICIOUS

PDF

74.2 KB Created: 2021-04-03 09:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d844f69ec359d18a9c5b46d4ba95598f SHA-1: cb16a72f8fb92d2020bab478233fcd62415c528e SHA-256: 0c19ca7b3d7faa0461527e827c9b50c62008ee3e20dc5322df8081eefd97b081
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. The ML classifier also strongly indicates maliciousness.

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://maypoin.ru/award?keyword=cognitive+test+sample+pdf PDF link annotation
    • https://cdn.sqhk.co/papebikuwi/cjgmXhe/coloring_books_for_sans_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420239/normal_5fed4ca89fcab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fe2d3e895171.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/djbhghc/rofiwal.pdfIn PDF document text
    • http://voicebftyi.com/ates_ve_su_2_kisilik_oyunlar_1zylk6.pdfIn PDF document text
    • http://tiktokhd.design/social_work_case_study_examples_and_answers4krtm.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/Lhibgf6/directv_now_app_on_samsung_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/hhahciG/mikuxinovadobutavu.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/amarakosha_in_kannada_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoselubiki/gfVDjdy/12397384526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd625b2366be.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/cXy6mjj/bluestacks_macro_recorder.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://polabufu.myartsonline.com/dipivozuzatato.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/capital_boitempo.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/34559610473.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/kazateb.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/fugakilefobokir.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/nosigimeferutegib.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/brother_hl_l2360dw_toner.pdfIn PDF document text
    • https://medlineplus.gov/lab-tests/cognitive-testing/In 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_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 5232 bytes
SHA-256: 72b58f3aa86f1f13b14dbfe255ccf3d51f1f657cac9a42d5f750668fb559b2b7
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 10632 bytes
SHA-256: 798c14852ede637a22d563f062abe3eec653cbbf19321388ac9654e30c17dde3

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