Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafc357a0eeec459…

MALICIOUS

PDF

77.7 KB Created: 2021-04-07 02:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 082da27f9cd53510b9fde64ea5d33087 SHA-1: 528ed025d8a8401f95417c907d7909e1bd9630e5 SHA-256: aafc357a0eeec4591cbbcea9624f0f2df0a1e24b9a1e50814f15abfd3704738b
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/award?keyword=time+table+up+board+2020+class+12+pdf+download PDF link annotation
    • https://cdn.sqhk.co/vovewotutal/8hchg82/jokufanarageseloduxotanuf.pdfIn PDF document text
    • https://cdn.sqhk.co/romumoxoleno/5U8jhij/descargar_latigo_de_sheldon_para_android.pdfIn PDF document text
    • http://xujadawowupu.scienceontheweb.net/tezaseduzolaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolelapideruse.epizy.com/ophthalmic_instruments_and_their_uses.pdfIn PDF document text
    • http://wifofevowogak.onlinewebshop.net/syma_x11_quadcopter.pdfIn PDF document text
    • http://xafofeb.epizy.com/23772130272.pdfIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_81344c2a410f408b9c641ceb0c19eaac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6005525e-d688-46ab-9606-ed1e2ffc025f/the_origins_of_totalitarianism_audiobook.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_b2630eb124a84c88a1badc72d2225319.pdf?index=trueIn PDF document text
    • http://wamifuxifopaxu.epizy.com/zenateseraripafube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7310ad6e-4571-4edd-b02a-49564d3df3fa/holt_mcdougal_geometry_chapter_7_test_form_a_answers.pdfIn PDF document text
    • http://jefevuxivux.epizy.com/orissa_human_development_report_2011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53a818b-00da-4be1-a729-6d9bf96236b9/p6x58d-e_uefi_bios.pdfIn PDF document text
    • http://paritoxo.rf.gd/notewatomomilojawudeweki.pdfIn PDF document text
    • http://tibupud.epizy.com/la_ciudad_latinoamericana_alan_gilbert.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_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 5808 bytes
SHA-256: 53be807855dbf8c966113c4823315544ab1aa6c35a47549f60a1812e4d920228
font_01_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 10524 bytes
SHA-256: 8cce79e04e476ee128e2a7000f3d32d291d5798851392dbcf3f5b9b494a2b0d5

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