Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ddbff84911cc4b…

MALICIOUS

PDF

82.3 KB Created: 2021-02-18 01:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a7aaecc1c934edb3f87174c89200d4aa SHA-1: 8e0bf0b1ebbdf9a552a67b5b6defcacef3fb020e SHA-256: b4ddbff84911cc4b99cddc1cc8e56eae29ca78f9543d010f945215ae5b4876e6
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 part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious lure designed to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=western+digital+my+cloud+mirror+gen+2+manual PDF link annotation
    • https://cdn.sqhk.co/zesunotu/hiGig5h/interesting_facts_about_meerkats_ks1.pdfIn PDF document text
    • http://mini-cam-v2.club/xokopeluri3pp36.pdfIn PDF document text
    • https://cdn.sqhk.co/bazopaxepifu/TjgmwoK/farurazuxamaxik.pdfIn PDF document text
    • http://sexesex.site/angry_crab_chicago_menu_prices6pbow.pdfIn PDF document text
    • http://garant-ritual.online/20544100021uj9a6.pdfIn PDF document text
    • http://yblda.fun/bodybuilding_diet_plan_android_app4pjjq.pdfIn PDF document text
    • http://jimubezisu.iblogger.org/bread_maker_panasonic_sd-_zb2502_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/0jjgiBU/throne_of_glass_series.pdfIn PDF document text
    • http://fit-italy.space/american_football_terms_in_spanishz383j.pdfIn PDF document text
    • http://zahlungsservice-ch.site/gastric_cancer_diagnosis_guidelinesvhmsh.pdfIn PDF document text
    • http://itprod.space/babifujuj9xrcv.pdfIn PDF document text
    • http://trikolor.site/skip_bombing_dcszcrs6.pdfIn PDF document text
    • http://agent-ritual495.online/le_grinch_film_complet_streaming_vf4evl3.pdfIn PDF document text
    • http://cashtanks.fun/center_align_form_in_htmlalepd.pdfIn PDF document text
    • http://roskycnmx.com/7170609331954i8x.pdfIn PDF document text
    • http://okclub.org/228434211046o5fk.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/shark_eating_fish_game_on_scratch3weyi.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rugapekazudi.epizy.com/ema_variation_guideline_2018.pdfIn PDF document text
    • http://tovezujatim.rf.gd/attach_image_to_online.pdfIn PDF document text
    • http://fopevuvowixapa.epizy.com/catheter_related_uti_guidelines.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 1724 bytes
SHA-256: 90fb1042126c15d8a796f6f88dc26108755fb6ca519e05b6d0de05ca6d3d969f
font_01_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 5508 bytes
SHA-256: 3bf0abe7e2622ba6df93431edcb2943a167c9880d3bf320d4952c007a3bd3665
font_02_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 12900 bytes
SHA-256: 71ee4527f39b41f9039c1b1560eb150f13150ba7dcbf68b2f9db721ff0568708
font_03_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3

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