Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a61037441bb77b4…

MALICIOUS

PDF

78.6 KB Created: 2021-03-16 09:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec14a43c4ed2953a94d6bc6fb0a37f21 SHA-1: 767edca3b98370b7d4d72ace3e8845dd38338ce6 SHA-256: 2a61037441bb77b47e433aeb6227f2147d0e168e0d32d651eb586827ef1184ee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly unrelated documents. The presence of external URIs suggests an attempt to redirect the user to malicious content.

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://jumiwimov.ru/123?utm_term=proper+mitotic+spindle+formation
    • http://bbflowers.net/8469570847559nlr.pdf
    • http://temilops.xyz/batman_arkham_knight_gcpd_riddler_informantmnz0g.pdf
    • http://options.expert/finding_volume_of_cylinder_cone_and_sphere_worksheethjl1f.pdf
    • https://cdn-cms.f-static.net/uploads/4377642/normal_6036cd6493d35.pdf
    • https://cdn-cms.f-static.net/uploads/4369768/normal_6023d6610091a.pdf
    • http://perofazafaja.22web.org/char-broil_tru-infrared_3-burner_grill_lowes.pdf
    • http://nesobaka9.xyz/897039873870kqoz.pdf
    • http://acupofjacob.com/zirolunodei9lh9.pdf
    • http://winoraama.space/spiral_dynamics_test_resultstg11l.pdf
    • http://prostotit.site/47825096085wpcqi.pdf
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5ff62129918be.pdf
    • http://usesucre.pro/955325986969iq97.pdf
    • https://cdn.sqhk.co/wujejelot/7idFYKX/83418760795.pdf
    • https://cdn-cms.f-static.net/uploads/4495707/normal_5fdc1188ae6a4.pdf
    • https://cdn.sqhk.co/luwiliziv/jjXZOVi/84265568458.pdf
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5ff667e75f68e.pdf
    • http://thesimplycompleteseries.com/4805450694782o0y.pdf
    • https://cdn.sqhk.co/xuzuvazol/B2bjhk7/47489838963.pdf
    • http://mastera-saydinga.ru/how_to_adjust_resistance_on_schwinn_ic4xyupp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ditajizuru.rf.gd/rubik_s_cube_7x7x7_solution_guide.pdf
    • http://virujafaxamer.epizy.com/38153249660.pdf
    • http://vobulag.rf.gd/finila.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_off0000f2c0.bin
00f32266004cefd3abf4d8b28116f27a8c451c35629f0481961a9333303c23f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 5300 bytes
font_01_sfnt_off000104b2.bin
246667fcc8377b826dcb6faea5b1dc7fdc6fb09594d19a19336f6a3aedd0e61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 12024 bytes

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