Malicious PDF — malware analysis report

Static analysis result for SHA-256 576d616012fe6b27…

MALICIOUS

PDF

88.9 KB Created: 2021-04-20 13:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3280d9f38beb82cc520eec42eec7a7e9 SHA-1: 1072c0a887c2ff7d990c74e678f70e5b75877d3a SHA-256: 576d616012fe6b27ffddf323ba3f5457e2c461ee3fae1d87e46890ba7405942a
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://golowaki.ru/strik?utm_term=tascam+dr+40+v2+vs+zoom+h4n PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388065/normal_6033de8a0cd6c.pdfIn PDF document text
    • https://cdn.sqhk.co/selodiro/yibdhgf/wolazufuditewijugov.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxikotimux/gfjCbLf/tratamiento_hiperaldosteronismo_primario.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_600a7922efeb9.pdfIn PDF document text
    • https://cdn.sqhk.co/rokijatu/isgggWk/dolphin_emulator_for_laptop_free.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/tjfuuss/castle_crashers_remastered_switch_review_ign.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/rahcTIW/zelizirepitufirazavixa.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/niajahc/fly_with_a_rope_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/YJzhhgW/formula_1_2020_seventy_edition_game_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/hjbiaig/74015904978.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/Lhbajdk/koxamogamifepazig.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/inMJItI/79122571661.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/gjtwjgO/donasawadoximalelowirije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_fa03c0feb078469d8afbc45239aef764.pdf?index=trueIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_55f1e065e69d45d9ae6a2463d7647392.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_cb272dc6f42d426094ad089097fddec3.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_f706fa8f8bd44f74ad367e92bec22693.pdf?index=trueIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_5e1c6a407f4a42f187da6cc5992e2f55.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 5568 bytes
SHA-256: 39aaa3dd12db7b2f5f1bf69c4563cb2b81709c0e9e2b5b700bdcdb93165870e3
font_01_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 3280 bytes
SHA-256: 2297d08da0885c3eb4ce3f002b38c878791d888d5cd24890c9be6293afce4610
font_02_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 11164 bytes
SHA-256: eae25b6d860f25f1a95429f90fd4d9d4d7817d37dc91232cff6d5cc6648b0e2e
font_03_sfnt_off00014081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14081 16120 bytes
SHA-256: 653593fd1d80a85ed6f0165f1aba34eea3860f78c4af0c5284fe4824caf7b9a9

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