Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa106cc28fff29fc…

MALICIOUS

PDF

95.2 KB Created: 2021-02-24 21:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e41786e8149c7878facdb30ae8fea6f4 SHA-1: 7ef3bcc62beb928eca5b0dd2c1a4f0d21a3d0438 SHA-256: aa106cc28fff29fc62912b7ac23822ae6befe80258a9d32a06bafd1233e1e2b5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=which+is+more+important+sun+moon+or+rising+sign PDF link annotation
    • http://dogoderusokita.iblogger.org/hp_elitebook_folio_9480m_charger_specs.pdfIn PDF document text
    • http://fortuneo-enligne.com/72934900418ymns0.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/r6jgdgh/the_walking_zombie_2_zombie_shooter_pc.pdfIn PDF document text
    • http://godulonu.22web.org/boxuvaxa.pdfIn PDF document text
    • http://neyroskakalka.site/53786792765uflzg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_600dc053e0b85.pdfIn PDF document text
    • http://my-favshopf.online/lafabilabanifexeroebgbh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fe7f77189d6c.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/jajgegc/48931592053.pdfIn PDF document text
    • http://taxavifosobedul.iblogger.org/futoburupadovogitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodenumaverap.epizy.com/vesetusepala.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/does_netflix_have_too_big_to_fail.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/37522998757.pdfIn PDF document text
    • http://lofopeba.rf.gd/aptoide_apk_for_pc_windows_10.pdfIn PDF document text
    • http://dujazenemelix.epizy.com/88855720821.pdfIn PDF document text
    • http://jokosen.atwebpages.com/how_much_is_tydus_talbott_worth.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 5328 bytes
SHA-256: cf0cde4b34b286728d6e5fe7c2d73e1695d9d5eda52db3cc57a4d119ffb03633
font_01_sfnt_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 11348 bytes
SHA-256: ab28caf9bf1c9fea25f300a8f7d61a24696930b9faa14d04bc5443be299222ee
font_02_sfnt_off00015899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15899 16064 bytes
SHA-256: 2bad467a3639e7270d00e4d92b62c633bdf3fca121352097ea953ab0934ed0fd

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