Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9912ea8fba21c0…

MALICIOUS

PDF

67.7 KB Created: 2021-04-01 10:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba77a2bc1376d5659cf8ec209a719e50 SHA-1: b94b481d0ff8dbf41faf2624082d562e1e77ca6e SHA-256: 4f9912ea8fba21c066fbb0c6656364895cd1d857567d9d794cacaad92d2cf148
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'practice test answers'. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/strik?utm_term=sat+practice+test+7+essay+answers
    • http://rosativiwam.mypressonline.com/bakopesisavakisoruragomu.pdf
    • http://streamsweets.com/48451572438qhrgz.pdf
    • http://rent-nout.site/sepopuy223.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://new-leggins.site/tuvasujimatabekosokuzabazwnmr.pdf
    • http://shoplus.info/falefazelibugamebdi0.pdf
    • http://promooffer.site/61160388952h3s31.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xumuritikoxuk.myartsonline.com/90477577542.pdf
    • https://s3.amazonaws.com/tesasubawalozan/73221539591.pdf
    • https://uploads.strikinglycdn.com/files/f4101d8d-276d-4a9c-b3c6-2eddb656a665/honda_rancher_350_2wd_tire_size.pdf
    • https://uploads.strikinglycdn.com/files/3ddcfe4f-3183-4fdd-87f4-242f3cdf787b/free_mouse_and_keyboard_recorder_3.1.3.2_license_code.pdf
    • https://uploads.strikinglycdn.com/files/d1fc2851-4a5c-4a82-af2d-00f11eb3fbf2/handheld_sewing_machine_instructions.pdf
    • https://s3.amazonaws.com/lebejos/planit_cabinet_vision_free.pdf
    • https://s3.amazonaws.com/gopifu/mukozeta.pdf
    • https://s3.amazonaws.com/zagapaxa/23190757061.pdf
    • https://uploads.strikinglycdn.com/files/bd4be30c-e09b-4600-88a3-d00bf4680201/6703655233.pdf
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_3fa41b5757674e6c861b2a21d1f4effd.pdf?index=true
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_a837ea185bb14d2982afcd813ac091b5.pdf?index=true
    • https://s3.amazonaws.com/mikibetiv/gas_forming_admixtures_ppt.pdf
    • http://viwudajokufado.atwebpages.com/talotidubamebipaji.pdf
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_6b95bca2c0d24f6d85119f47a9d85303.pdf?index=true
    • http://newemepakirid.myartsonline.com/peroliguwipi.pdf
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_23112a63f7ac45e4ad2141f19c08cda6.pdf?index=true
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_9d2cf44e626d46ccb55d0ad5c2d9b7c8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39003330-9060-44fc-88dd-03ddf907eb4f/craftsman_10_radial_arm_saw_attachments.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_off0000cb81.bin
70319069700b9a3f5b0cfe1d167ce2cfb85d0bee42070190e9fab73803d758f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 5272 bytes
font_01_sfnt_off0000dd9b.bin
fdcc15641c774a965ce8407d61207b3666cd8257545d22c8ecc38a8f2979806d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 10360 bytes

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