Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fef737319b968db…

MALICIOUS

PDF

82.8 KB Created: 2021-03-28 14:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9bf6391492c7ea4ce1fe061d38927454 SHA-1: ccd769bc5536e27d9911eb0204a40529025bd0ae SHA-256: 8fef737319b968db054006d84b76ecabddb4db36f3022059f2aff2c696aaaa7d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism designed to host or distribute malicious content. The document body, though partially corrupted, indicates a lure related to downloading educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=ba+1st+year+english+book+pdf+download PDF link annotation
    • http://pinezotamex.getenjoyment.net/receptor_agonista_y_antagonista.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/bwDhfja/52043137224.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/thank_you_for_being_late_friedman_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/jihj4ij/18021016346.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/Dx6dgdX/cara_skip_anonymous_chat_telegram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403807/normal_5feeb7a302111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_60420c78ab549.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/el_cabala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd420277-d07e-4d09-9246-d62650844fa7/xofopusukimibibik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e521d8-628c-49d6-bc82-646cff72ce31/17091420517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6237a4-567f-4959-91fc-48f2d9c75f4a/what_meaning_rehabilitation_in_punjabi.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/frontline_commando_d_day_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eba2369-52d8-4c77-8cc5-4e4acd1df64a/explain_how_radiocarbon_dating_works.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a678783-25bf-4270-9795-374ab2e65715/zoxagobofefixodejonipibaz.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/watch_free_tv_channel_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a801c5-449c-432f-8636-542397eb7f01/how_to_use_cuisinart_dcc-3200.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/mefusolufamoxejal.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/tamil_new_movies_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcda054-20a4-4e10-a59b-a86ad59695a1/acer_aspire_e15_gaming_laptop_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/nedira.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_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 5804 bytes
SHA-256: 0007a9db7b86675c2365d69524625dd119f7ebac9f450788b0530de93693b837
font_01_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 11280 bytes
SHA-256: 452c80f472143089c05e9faec33fae38b4db1080ca1096867d31a5fffd460bbb

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