Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9385b883104bb9…

MALICIOUS

PDF

76.7 KB Created: 2021-02-20 07:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8b7a5685455eededd04a81a9bf4d0615 SHA-1: 53e7c25b7cb188741e6ef66b7dbd85c55882e580 SHA-256: af9385b883104bb9316cfc2e37825212bfc467e9e08eb9f67925f18c2ddd10f1
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=how+i+became+a+pirate+comprehension+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417429/normal_601e649b4a6f0.pdfIn PDF document text
    • http://tamakar.xyz/437_a_bail_bond_formatziyr0.pdfIn PDF document text
    • http://bristol-yalta.run/mcmurry_organic_chemistry_6th_edition4kby6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424683/normal_5ffabc4001439.pdfIn PDF document text
    • http://smartcreditscore.info/80252265122bg5e8.pdfIn PDF document text
    • http://ca-manalapan.space/bloodborne_chalice_dungeon_order_guigy8uh.pdfIn PDF document text
    • http://unlockdeals.shop/ate_quando_entregar_o_imposto_de_renda_202049zx9.pdfIn PDF document text
    • http://hs-life.ru/dufizedirixuqd2zj.pdfIn PDF document text
    • http://volosaty100.xyz/7540057667101ec0.pdfIn PDF document text
    • http://kawlites.online/858978551964w5nw.pdfIn PDF document text
    • http://canonsburglake.org/neumann_microphone_bookp08qm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_600c44530e40f.pdfIn PDF document text
    • http://tesocoin.online/android_device_manager_forgot_passwordsk37d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwolobeduju.rf.gd/tejafebenonagisodosulup.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/cordless_phones_with_answering_machine_uk.pdfIn PDF document text
    • http://gedamodeges.epizy.com/java_tutorial_free_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/nizilevepoxekine.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/polygons_worksheet_grade_4.pdfIn PDF document text
    • http://xijasuda.rf.gd/xovevubemuwofelubamevuxuk.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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 5460 bytes
SHA-256: 7dfa038d16bbec5604597e245b629d1fc390afea666fd13412bb8a4188ef0d20
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 10976 bytes
SHA-256: 3908b1038abe5e61b2a649e55b76c8767d80b0467deee31ce6f61ea10e40b905

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