Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f3d91777f723f8…

MALICIOUS

PDF

82.7 KB Created: 2021-03-18 22:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd51fb291aebc7f373973687da465223 SHA-1: 2eae983b9f23f2bf723a4744f827f3809a46ba0f SHA-256: 15f3d91777f723f830b859cffe406b6c21274db450f53212a89a450478702b17
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://leonvi.ru/wix?keyword=english+essentials+answer+key
    • https://cdn.sqhk.co/legexere/Aja9hgb/19974657001.pdf
    • https://cdn.sqhk.co/texaxonaguzo/hiiaidx/competition_music_mp4.pdf
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/6217734.pdf
    • https://cdn.sqhk.co/vutabopi/qjfwUhh/balotijidudidonarati.pdf
    • http://mibejar.sportsontheweb.net/bear_archery_cruzer_x_rth_compound_bow_package.pdf
    • http://famozosivupiwij.sportsontheweb.net/kibagetolimizuketa.pdf
    • https://cdn.sqhk.co/ludukuni/NMBjigi/5956799423.pdf
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/vaweneruvatewowat.pdf
    • https://febasenijig.weebly.com/uploads/1/3/1/3/131379808/8716904e82.pdf
    • https://cdn.sqhk.co/lusikagidet/ibEitja/zeus_tattoo_forearm.pdf
    • https://cdn.sqhk.co/vekuzajomugi/0hiZNgd/angie_s_list_portland.pdf
    • https://doriruvoni.weebly.com/uploads/1/3/4/5/134585963/4791b905509.pdf
    • https://cdn.sqhk.co/letojeka/iazJiim/download_free_offline_english_dictionary_for_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_6f25da0443b94114b0046085ef511068.pdf?index=true
    • http://pizuzol.onlinewebshop.net/office_administrator_job_description_cv.pdf
    • http://gurabagoderes.atwebpages.com/72052026355.pdf
    • https://uploads.strikinglycdn.com/files/7b4da23a-4655-4720-850e-6014556befbd/wubuxojoguwokuridigazilu.pdf
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_abd46c8ab12149e985fc9814cd6ce57e.pdf?index=true
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_24866afd47e04345bc87cde3f5caa9ee.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef87.bin
6e139445e89018582499bbdebb7bcdfb4039931f74624e5aadcf05a2875bb293		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 5160 bytes
font_01_sfnt_off0001012d.bin
4f347d34c7e3d454bf19433a8703f74bcf07a9137203d7fb2022c4d10791fdb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 12056 bytes
font_02_sfnt_off00012842.bin
66085bd33cb55e0ce391350d0a43119f109c2555ce96eb5f7cd622e5178496ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12842 16100 bytes

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