Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d50e49d4a59b6e…

MALICIOUS

PDF

70.4 KB Created: 2021-02-17 01:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3f213e5b9f3af452ea172c1a469490dd SHA-1: 9f89957b4f789320e3acc78f34c83da37d40bcb3 SHA-256: f8d50e49d4a59b6e346c552e410c08da39efea5f9125e1c9240dfb918e937e78
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript, though not directly executable in this context, suggests a potential for more complex malicious actions if the PDF were to be rendered in an environment that supports it.

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://leonvi.ru/aws?utm_term=legal+terminology+practice+test PDF link annotation
    • https://cdn.sqhk.co/fewibefanid/cIdjL60/dhoom_2_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/jijbgDQ/39729238919.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/Z0ZJijV/dead_rain_new_zombie_virus.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/EjgOeij/23103093331.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/9ji0Mhg/tiktok_star_died_in_2020.pdfIn PDF document text
    • http://groby-ritual.online/average_speed_and_average_velocity_problemss952k.pdfIn PDF document text
    • http://christinaanddavid2019.com/rumurosewakinepipevedoxae9hk9.pdfIn PDF document text
    • http://vorgazme.com/shahryar_and_scheherazaded56wd.pdfIn PDF document text
    • http://givepamodugag.22web.org/49794887965.pdfIn PDF document text
    • https://cdn.sqhk.co/ratobomebal/fbMyWiC/shock_fast_bikes_review.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/gNiXLVt/32873386121.pdfIn PDF document text
    • http://jirafka.space/community_center_design_guide4mgsa.pdfIn PDF document text
    • http://converstarget.ru/willie_nelson_songs_youtubei7uto.pdfIn PDF document text
    • http://dijobojanojo.22web.org/maths_textbook_class_12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zigixukotezu.epizy.com/26801122803.pdfIn PDF document text
    • http://jujodixawo.rf.gd/87918314175.pdfIn PDF document text
    • http://jifaradazuzigo.rf.gd/95855459200.pdfIn PDF document text
    • http://dedapudebofeje.rf.gd/qualities_of_a_good_leader_essay.pdfIn PDF document text
    • http://sudolurimav.epizy.com/uni_hamburg_bafg_formblatt_1.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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 5296 bytes
SHA-256: 4e366feeceb22c27bb2eee737c7e6ed5b83d8fa26556fc66c3850095572072ca
font_01_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 11164 bytes
SHA-256: 97c04d6bbbdbdfa3a316d4603545b6fe9e35bc4858ba5416fd0f1f25e1f72900

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