Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7759f80c6fcb6e…

MALICIOUS

PDF

68.9 KB Created: 2021-03-03 12:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3baf9bb8c66b82c5ebfa00a4a3f0f0aa SHA-1: cdaa6f6206a754eb6c4d3a31a2ea00965fd04cc3 SHA-256: be7759f80c6fcb6eef627a75cb827163b4bca9d99b6a9040b55b31cbc44764ab
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru' which appears to be a lure for product searches. The PDF structure and numerous links suggest it functions as a link farm or redirection mechanism to potentially malicious sites, aligning with phishing or malware distribution tactics.

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/wb?keyword=ti-84%20plus%20c%20silver%20edition%20charger%20best%20buy PDF link annotation
    • http://tazizaj.iblogger.org/54075005327.pdfIn PDF document text
    • http://laxeded.iblogger.org/bob_ross_song.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/navubuxekusi.pdfIn PDF document text
    • http://vulefuxudonad.22web.org/iphone_5_activation_lock_removal_software.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/star_wars_rebels_ahsoka_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5fdb19d8358d3.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/zilagekotosemot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_5ffc9f638873d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426261/normal_603847336555f.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/cZKka66/live_football_streaming_apps_for_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefetuzuzip.myartsonline.com/john_deere_compact_tractors_near_me.pdfIn PDF document text
    • http://vofufedufis.rf.gd/biodata_format_for_marriage_doc.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/how_to_do_a_budget_in_quicken.pdfIn PDF document text
    • http://dufuvebali.rf.gd/adverse_reaction_reporting_guidance_document.pdfIn PDF document text
    • http://bimumebuzof.epizy.com/somigutabe.pdfIn PDF document text
    • http://fixiwerasame.rf.gd/80592538610.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/63478744211.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/lenovo_t430_charger_voltage.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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 5900 bytes
SHA-256: 414ff3c451127e56390cdee2c1dbaad69b688904c2e3e7da9e29c64d321b46ef
font_01_sfnt_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 10688 bytes
SHA-256: 544ec49ac2b34d6eac1b32cfc6d5220dd5c2b664dda3e81e1ef41f2336fe6519

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