Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea8d6ef74654ecd…

MALICIOUS

PDF

120.2 KB Created: 2021-02-18 16:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5e12d84381dbf5ec88fc1f948fc5b657 SHA-1: 4aae3422c9c804a7a521e716a676aa496212e909 SHA-256: 5ea8d6ef74654ecdcb9bbdce12b25e1a0e63256d566238ac94bfcf8b1d6b10c1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=line+6+pod+2.0+manual+portugues+pdf PDF link annotation
    • https://cdn.sqhk.co/nivatasob/haYKgdG/38145470039.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/hg6ifja/autodesk_vex_robotics_curriculum.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/EjiTr9g/primeval_movie_review.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/RYjjDPO/kenidizejomiruluziko.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/Z3hfjb4/73751913934.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/ibFkGia/7117649277.pdfIn PDF document text
    • http://powerhdniy.space/5721490683166n6o.pdfIn PDF document text
    • https://dodilepu.weebly.com/uploads/1/3/4/4/134444379/tovemowasilek.pdfIn PDF document text
    • https://cdn.sqhk.co/kowetitemaro/VzhgAid/mb_baltic_merchants.pdfIn PDF document text
    • https://cdn.sqhk.co/wamefuvew/ehjhsij/formula_for_lateral_area_of_a_cylinder.pdfIn PDF document text
    • https://cdn.sqhk.co/nubowolimit/b8hiibL/86193325484.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/2pOAn8M/nujalokibowekoz.pdfIn PDF document text
    • http://pek-24.cc/whatsapp_for_mac_os_10._6._8c7nuu.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/cuxtjhL/60011973916.pdfIn PDF document text
    • https://jolejijiwunepa.weebly.com/uploads/1/3/5/3/135334118/9942930.pdfIn PDF document text
    • http://goodshopsales.xyz/38921761424fflbl.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/dr_house_capitulos_completos_en_espaC3B1ol_latino13q7u.pdfIn PDF document text
    • http://wersita.fun/fubuvetugefi8dpg3.pdfIn PDF document text
    • http://tixshopclub.space/samsung_galaxy_s6_ce0168_pricelus84.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/JhShbha/19363297206.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001649a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1649A 3032 bytes
SHA-256: 9bd58b7f3a64cdf6957bcac4061ed67f519300aa2ed6fe3b87c734d43bcfcd74
font_01_sfnt_off00016f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6C 5760 bytes
SHA-256: 63040f80dc4f4f3e7eb156c35220d2cf7a363dca21a201a4d6db1e7458c440a1
font_02_sfnt_off000182fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182FE 19428 bytes
SHA-256: 67f0f97d16b9227a99761cd41eaf9d6ebdc696076d14c9511fd24cbb2de5be3d
font_03_sfnt_off0001bb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB4E 16228 bytes
SHA-256: 86e47eef4ffe79909b75d54993846b605a9e6f2c59546ae3a46b7f4b8a9668a8