Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a5ccd2595ec14e…

MALICIOUS

PDF

82.0 KB Created: 2021-05-04 04:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a71f4cb086ada9e244cbbdaf73d9ad9d SHA-1: 785ffdb38d6b13a9a542823be8af1fe5cf01513f SHA-256: a6a5ccd2595ec14e5470455e41ee20bd65e27e97141c353f2adb901f167ce06a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and contains a significant number of external links, indicating it is part of a link farm designed to redirect users to potentially harmful sites. The presence of numerous links on disposable hosting further supports this assessment. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://xezojetit.ru/strik?utm_term=how+to+teach+writing+2nd+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482849/normal_5fd81b0d0cd90.pdfIn PDF document text
    • http://vseti.life/35536539314bcwgt.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/wQgf5Xp/iphone_notification_ringtone_download_2019.pdfIn PDF document text
    • http://evromotors.net/buxamivalobolemipesatictt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_6065425cef596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_6067e9083c95f.pdfIn PDF document text
    • https://cdn.sqhk.co/tekemozuj/Bhd57ji/whatsapp_business_web_api.pdfIn PDF document text
    • http://maska-respirator.shop/chemistry_dimensional_analysis_practice_iv_answersat1wz.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/c7jb4hd/jodikofijominedazar.pdfIn PDF document text
    • http://idealicaitalia-official.site/bible_quiz_questions_and_answers_from_matthew_in_teluguxsx48.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/81507765997ijrh5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_604cc44016309.pdfIn PDF document text
    • http://roskycnmx.com/21497083430fimsa.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/nulebolaxale1lnit.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/78dcdd51-e8a3-490a-a67f-26cc2c8fc069/tufusixaketulosog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c53523-a5eb-46d4-bf32-23521cd49731/6173483219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba659c9c-7b14-41ef-a5fc-cc4cba8e5d2a/kawosoxanipidunupoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cad3761-41dd-41a8-9cde-4094f729b5c9/28549531185.pdfIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_34940c58af03486e8ae0322702f29679.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db54ef1-6ad0-42f0-89f0-36804192c34e/97855164018.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_e3c6eeb2eaac4d40b2d0e04b238d6965.pdf?index=trueIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_03c676d61d1f47ae8b902360828cb34e.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_59b02444eb4144449409452c99f0e888.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 5176 bytes
SHA-256: 96ea919718a38a796eef0bbab084888e84a8592aa3c25713ff70908535fe8096
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 10476 bytes
SHA-256: da41280b259e8a5e855d6f0c81fe77e298e7f9013f7add6914ce3a2f94946941
font_02_sfnt_off00012421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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