Malicious PDF — malware analysis report

Static analysis result for SHA-256 78efacd68af60638…

MALICIOUS

PDF

70.9 KB Created: 2021-02-22 12:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0093de8311847c8ab8f665975e377b3d SHA-1: 6f3c5a0c2678aec37d77ee52bbb6845b539836fe SHA-256: 78efacd68af60638a3568a7d6863412f8add0ffdd3a1955444f361146b1c7efb
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware delivery.

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://baarspo.ru/wb?keyword=harry%20potter%208%20release%20date PDF link annotation
    • http://fitnesspack.net/mixed_fraction_multiplication_worksheet2mi17.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/36590706640ffws7.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/jbjcgcQ/snake_simulator_mod_apk_download.pdfIn PDF document text
    • http://tixshopclub.fun/minecraft_game_download_for_macktxsc.pdfIn PDF document text
    • http://hookup671.site/rataxonukuix56d.pdfIn PDF document text
    • http://buylettersonline.com/best_free_movies_sites_2018xj1ri.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/fhaHjhj/amazing_words_that_start_with_the_letter_m.pdfIn PDF document text
    • http://timelessdecorum.com/dogukikex68t04.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/hfSDTif/black_screen_youtube_fix.pdfIn PDF document text
    • http://limons.space/soxebenunitafuxerov3bvac.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/GjiNeia/desert_battleground_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/saltwater_fishing_gear_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/naruto_shippuden_games_for_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/pixijag.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_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 5212 bytes
SHA-256: bfa539d0a0240f3e106e34559411da2a2240dd8129704146b379b80ea3fdb25d
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10968 bytes
SHA-256: 1686922665ca864b109ba9c9cc48fa907f861278b19ce952cb15c5bb1849063d

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