Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59d440de1872ecb…

MALICIOUS

PDF

63.2 KB Created: 2021-02-14 13:37:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4229f7b7073e0866b64f3aa156537831 SHA-1: 1e223d2a27a6596d7f11bc24b6cce5dbb72460f9 SHA-256: f59d440de1872ecb3e196e54ea3a378b0e92e8bf31d5d3498de57102d9a199c6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'maypoin.ru/wix?keyword=mighty+mule+keypad+not+working', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=mighty+mule+keypad+not+working PDF link annotation
    • http://girlita.space/bmw_s1000rr_2016_manual7b5du.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/jRlm8ge/leap_year_on_netflix_canada.pdfIn PDF document text
    • http://limecash.xyz/189558673617nnb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fcd0a4eea517.pdfIn PDF document text
    • https://cdn.sqhk.co/gumakulex/gjZ8B1k/90250182045.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/hajjEjd/bouncy_ball_games.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/Mlxoibq/comics_unleashed_guests_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/djagqjc/joplin_mo_weather_forecast_today.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/endgame_4k_digital.pdfIn PDF document text
    • http://esagafow.fun/sound_effects_warwick_ri7dh1c.pdfIn PDF document text
    • https://cdn.sqhk.co/tufiroxova/gjdTBo8/galubamo.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/jgSqANd/hmrc_self_employed_grant_claim_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_60145c9ab29b5.pdfIn PDF document text
    • http://vovevowumusiki.iblogger.org/bmct_port_berthing_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufufud.epizy.com/kudepafiro.pdfIn PDF document text
    • http://bitixojofesozi.rf.gd/wexokesupolojapazu.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_off0000b8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FB 5456 bytes
SHA-256: a5c8e35fa03ee293f573c8e6b98b2fd75179c3e5c4cdfe91f196ba49d6fe580f
font_01_sfnt_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 10260 bytes
SHA-256: aff926592bb8e56e72dec3e19bc2c95ccf635378ef9580fd542dc06015e76696

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