Malicious PDF — malware analysis report

Static analysis result for SHA-256 5580e5ded5e3859e…

MALICIOUS

PDF

77.8 KB Created: 2021-04-19 20:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d31731379821de11962972ba772bce33 SHA-1: 781f69c30006931ba7e69a0595df1774e3063e99 SHA-256: 5580e5ded5e3859e0971ad8c7576fadcffc52fbcdd4c69b7e0a647041e754764
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains elements suggestive of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. The presence of numerous external URIs, including one pointing to 'nipisod.ru', suggests the document is designed to redirect users to malicious sites or initiate further compromise. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/strik?utm_term=boy+scout+merit+badge+classes+maryland
    • https://cdn.sqhk.co/zadoweferoxe/fW2RZCn/1553556496.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://topstop.site/is_sidereal_and_vedic_astrology_the_samea4qk1.pdf
    • http://muldwych.com/525803770952hfb8.pdf
    • http://astrology-personal.online/bazusizeturavd6lr3.pdf
    • http://help-copyrighteamservice.com/478003701829t9g1.pdf
    • http://trackengine.host/sony_rx100_mark_iii_manualvurfw.pdf
    • https://cdn.sqhk.co/tefulobesa/ieifSji/15119521677.pdf
    • http://thrivewebs.com/1798904942cunci.pdf
    • http://rent-nout.site/java_swing_button_click_event_exampleo0gxi.pdf
    • http://varistop.site/there_are_no_logon_servers_available_windows_10_fixaa06m.pdf
    • https://cdn.sqhk.co/sozasusu/nPgeHje/contact_lenses_order_online_usa.pdf
    • https://www.newenglandbasecamp
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59eff8c1-d752-47cf-ab29-64e860148109/2nd_smallest_city_in_the_world_by_area.pdf
    • https://uploads.strikinglycdn.com/files/bd013968-b50b-4622-a9ea-ba499f97559c/best_stock_watchlist_app_canada.pdf
    • http://tasebofav.rf.gd/pidutewunati.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_52140e1e1f3947bcbcf93fe3d6f0ca8a.pdf?index=true
    • http://pugatexekar.rf.gd/3d_exporter_for_autodesk_inventor.pdf
    • https://uploads.strikinglycdn.com/files/37bc1d3e-6fb8-48b1-836b-809b129e6bcf/gamonuboderovusowitub.pdf
    • http://xurebamokasepa.epizy.com/venog.pdf
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_92c18571419b4e33924521ce3af91198.pdf?index=true
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_e84dd79b4f43434f89af5bdffa5c8ab6.pdf?index=true
    • http://kukalofawofami.epizy.com/42371306838.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effa.bin
3c4f250b09b725f5fc2a7fb2ee099c50941ed06d740f13dcf38dcdf27454fde6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 5552 bytes
font_01_sfnt_off000102d1.bin
3f548f75feeddba8046219db887e69e039ff903c5a3b61823ebfb5d79195235c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 11396 bytes

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