Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cefe165db16b34…

MALICIOUS

PDF

73.0 KB Created: 2021-04-05 13:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 80482233e9a13a527fcede807cce9d3a SHA-1: 546cd7e7a41fdf1e6b917fdb381cffb98ee869eb SHA-256: 56cefe165db16b34a2a61c36c5fd3b8e82b5039d45e25dca11e646a7eb88af96
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 0.9997

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://resalured.ru/wix?keyword=adding+and+subtracting+decimals+word+problems+worksheets+5th+grade PDF link annotation
    • http://meetchat.space/what_does_604_mean_in_angel_numberskgfis.pdfIn PDF document text
    • http://plsale.pro/666535529068gl8k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_603ede0c654e9.pdfIn PDF document text
    • http://astropsychology.website/how_to_barre_chords_easiera825a.pdfIn PDF document text
    • http://zyzycheat8.xyz/62922462793j45z6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_601dff98ca165.pdfIn PDF document text
    • http://shtancircul.site/38640828571gdtqg.pdfIn PDF document text
    • http://doweryklkq.space/othello_act_1_scene_2_analysis_a_levelj0s8z.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/pejosaputezivini.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/kgg03qq/89283978735.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/sibipifubaxafilima.pdfIn PDF document text
    • http://termometr-medikal.site/95454469982idtw1.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/iiTOOgh/lalisuxubitujes.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/hdhbRyv/mma_manager_apk.pdfIn PDF document text
    • http://gratoraama.website/zaxefomujuguxagisoxilzhlwg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xasagode.myartsonline.com/matogemegosutofojujubive.pdfIn PDF document text
    • http://lurarapekakaka.atwebpages.com/lusibum.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/9398411839.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/explain_how_to_use_the_standard_normal_table_to_find_the_probability.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_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 5896 bytes
SHA-256: ea94a058c33e8f79ee2043f15185d5e35d93bfc6d7caa6883e9c1ea693b8541d
font_01_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 10212 bytes
SHA-256: f5b38dd50c3ed28909fb0b0d67a5fbfcf89e2a47f7c1eed89621747354f6219d

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