Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa39570789f16e3…

MALICIOUS

PDF

72.1 KB Created: 2021-02-11 08:29:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ea030985bbb69869bfb61fb250249645 SHA-1: ef60dc55746a1dcb0b0820f01bc4a1ae590de0eb SHA-256: 2aa39570789f16e30627c75d3ce477fdb2101c561b0e603a6b5f09338477cb46
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=balliol+lower+school+uniform PDF link annotation
    • http://sudedelanefozuk.66ghz.com/adobe_premiere_cs6_tutorials_free.pdfIn PDF document text
    • http://chunyoo.com/gofuwn0miy.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/BlighdX/furniture_mod_for_minecraft_pocket_edition_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/hcMgdia/gidavedeterafa.pdfIn PDF document text
    • http://idealslimitalia-official.site/17234264948ik7dg.pdfIn PDF document text
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/9741716.pdfIn PDF document text
    • http://tubudemawaxoki.iblogger.org/53190634425.pdfIn PDF document text
    • https://dixoparogazasa.weebly.com/uploads/1/3/1/8/131871726/suxuvopepel_sabinegojixu_vaxevawikel.pdfIn PDF document text
    • http://nemurirewokow.iblogger.org/indesign_calendar_templates_free.pdfIn PDF document text
    • https://gepadera.weebly.com/uploads/1/3/0/7/130740344/982993.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/2393165.pdfIn PDF document text
    • http://werenntaq.online/33448675509ti57h.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/9294012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_6023ec453bfc5.pdfIn PDF document text
    • https://cdn.sqhk.co/lawikuto/jfcicBx/4633111958.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/Zv6tEXe/snowball_fight_pc_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasunuvelew.epizy.com/bahubali_2_4k_video_songs_free.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/pikofobomimesadevojotofu.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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 5260 bytes
SHA-256: 1a8839aa14e2cf4630d6f1cf11454eb79a5d626682b68ec866b8ef8f31e3e485
font_01_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 11380 bytes
SHA-256: f58e493d23e34aa92572ea9f5b7daf9f600927b12c84ba7ae1595df914da9385

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