Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72f41aa865fd56f…

MALICIOUS

PDF

158.4 KB Created: 2021-01-19 12:34:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2a18941e0e4bd38a1c41e79a396dd467 SHA-1: 15bdd76580039fcb229d4612580362e364fc58a8 SHA-256: e72f41aa865fd56f91493bd72a335dcfbc64c0c431814d83af52ce7d619099df
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by a machine learning classifier and ClamAV as malicious. The heuristic 'SE_URGENCY_LURE' suggests a phishing pretext, and the presence of numerous links, including one to 'crophysi.ru', indicates a likely attempt to redirect the user to a malicious site for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/123?utm_term=eudemons+online+steam PDF link annotation
    • https://cdn.sqhk.co/kupovite/geJrrih/didenibodixemu.pdfIn PDF document text
    • http://nubuweso.iblogger.org/lucid_dreaming_a_beginner_s_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/ridhbAL/redaxelarudomokoranal.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/AUijial/funny_dog_videos_2020_youtube.pdfIn PDF document text
    • https://site-1176476.mozfiles.com/files/1176476/febamimanezujizamikoka.pdfIn PDF document text
    • http://revenularozudo.66ghz.com/free_video_er_mp4_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/IMRjgjg/make_your_own_clay_pottery_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezedavepajizum.rf.gd/jorenuxurinopubaligoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/cwm_apk_download.pdfIn PDF document text
    • http://sabinozugi.epizy.com/assassination_games_full_movie_free.pdfIn PDF document text
    • http://nonulalomijowo.epizy.com/najatotuvaliwowosa.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/jusudedopi.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/cracker_barrel_mashed_potatoes_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/fundamental_accounting_principles_wild.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000224ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224EE 3948 bytes
SHA-256: 1f22d89b4ca80fc1ed7157226ba3f1d69beaf227ce19ed7465bd9dfb862fb8dd
font_01_sfnt_off000232e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232E9 4832 bytes
SHA-256: 850f96852bc1fda9f9a828d60d099c9d858cde9e93fc170a4bb7e94845f0fc88
font_02_sfnt_off00024340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24340 13064 bytes
SHA-256: da88a70e3d31da74f14f542b84499c0af2a783f9b96f17b17acc1e62bc145348

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