Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8ee028d77f3de8…

MALICIOUS

PDF

83.8 KB Created: 2021-02-21 09:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5d9dc504540c2d23bd0097999b9d2580 SHA-1: 549362d0a95ac1853a0188c918c94291f6ede6ad SHA-256: 0c8ee028d77f3de8d4d9cc32a600f66c9536434f88a368b6f760ee9e610dc21d
226 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security gateways by encrypting the actual payload, which is then likely delivered via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://baarspo.ru/wix?keyword=you+tv+player+apk PDF link annotation
    • https://cdn.sqhk.co/jifexekezeli/gdzaihP/underworld_football_manager_bribe_attack_steal.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/a16984635072446.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/aib3QN9/lethargy_pronunciation_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/ketofebem/ahbgfii/rasadepoli.pdfIn PDF document text
    • http://helpcopyright-service.com/line_graph_worksheet_for_7th_gradetxdpy.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/qklgfri/i_can_paint_game_free.pdfIn PDF document text
    • http://trynutra.shop/tema_masha_e_o_urso_festa_infantil3oxhe.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/gdifjf0/28033350101.pdfIn PDF document text
    • http://basiditdcf.space/rigidewellfuo4.pdfIn PDF document text
    • http://subbellassecret.com/bijanejemkqzw.pdfIn PDF document text
    • http://hs-life.ru/jumuroh763z.pdfIn PDF document text
    • http://lessonsonline.site/bafebaxefug8rv2g.pdfIn PDF document text
    • https://lekorasosin.weebly.com/uploads/1/3/4/6/134612915/763dd70f9885c.pdfIn PDF document text
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/7004361.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/fd3ab52732.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/ifqhgln/rank_smelling_gas.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/hd702ST/teacher_aide_professional_development.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vasofirida/soxawomo.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/7079336546.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/accountant_cv_sample.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_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 4820 bytes
SHA-256: cfcc3b621ef44549a91b048f80bb32ceef9e5f347b2a723dc4040963860a0a9e
font_01_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 10440 bytes
SHA-256: 79a8134fd37df02f37662e4f0bf5d20d1bf0063e6976ee0d2e878c851b51e869

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