Malicious PDF — malware analysis report

Static analysis result for SHA-256 0427c0faf9c0f33b…

MALICIOUS

PDF

76.4 KB Created: 2021-04-05 19:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a81216169f121258d0503ad6d21b1d9f SHA-1: 2304ad5ef8141a5d05b0ab2838966687087ce44f SHA-256: 0427c0faf9c0f33b1a1d233d84ec4d736aaa175d6f7f4aa4f8dc109f16413425
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. While the document body is heavily corrupted, the heuristics strongly suggest the primary purpose is to redirect users to a network of external PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://dilawiputonu.mypressonline.com/10th_new_guide_2020_to_2020.pdf
    • http://vukosam.22web.org/fanezamomusofikom.pdf
    • http://pedumerik.sportsontheweb.net/25888834337.pdf
    • http://dujaliz.iblogger.org/esma_remuneration_guidelines_aifmd_2013.pdf
    • http://povulofi.mywebcommunity.org/93261156285.pdf
    • http://zowogusatutojus.mywebcommunity.org/arihant_general_knowledge_book_in_tamil_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4420602/normal_60390a009d6e0.pdf
    • https://cdn-cms.f-static.net/uploads/4367304/normal_60590b85696d2.pdf
    • http://xariketixagat.mypressonline.com/basic_civil_engineering_bhavikatti.pdf
    • http://xorabawik.medianewsonline.com/how_to_repair_water_pump_leak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=magic%20bullet%20personal%20blender%20cups
    • http://fijumusuxolegoj.atwebpages.com/cost_estimation_methods_in_management_accounting.pdf
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_71e7363128e54168b926216d693723f5.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_17912744df4f46af87911aec23ca69ce.pdf?index=true
    • http://tefetuzuzip.myartsonline.com/77629436238.pdf
    • http://ditajizuru.rf.gd/sodifor.pdf
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_53f0ca87f31549668122954786d62069.pdf?index=true
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_37fc92ae5ee54e9db683bac372229781.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_9afc5b4067a74933b229fde5cd19fb2d.pdf?index=true
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_1f94be1296654cb59997a62675857ed3.pdf?index=true
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_3346f28a6d1e45d19c9c5d83f6fe77f2.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_b834185cd8994d01a3a1a1198b145e87.pdf?index=true
    • http://raxegujanamefas.atwebpages.com/13330995385.pdf
    • http://bujekotu.atwebpages.com/continuous_stirred_tank_bioreactor.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_off0000ed99.bin
9137e6e57f074260c1e7aeb235a60ad2dac70ea59b5e3a80897a905e3134d899		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5384 bytes
font_01_sfnt_off0000fffb.bin
c12c9f3da709c3a371652c12343536421731adbdc743b822b260f010d048b132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 10692 bytes

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