Malicious PDF — malware analysis report

Static analysis result for SHA-256 d863da8c326a0499…

MALICIOUS

PDF

77.4 KB Created: 2021-04-21 20:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7bbbfc5deed6e05b4eb082d825ee8d18 SHA-1: 72f922633638d89e0809d175a3053df9a53ee80f SHA-256: d863da8c326a0499aa2d6e72b75c804d616f8d871bcce3bbb0dd78bd2bb40b43
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely to facilitate phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=are+landlords+responsible+for+carpet+cleaning In PDF document text
    • http://xinumazujo.iblogger.org/what_order_should_i_read_the_warcraft_books.pdfIn PDF document text
    • https://cdn.sqhk.co/tuminageka/uhjjajj/bakitakegesarenosofukim.pdfIn PDF document text
    • http://bighome.space/880583734651iziw.pdfIn PDF document text
    • http://bewalunokonu.22web.org/jifofutizosilitof.pdfIn PDF document text
    • http://docita.fun/anushka_sen_photos_hd_wallpaperv27gu.pdfIn PDF document text
    • http://allerop.xyz/72188425619aga4r.pdfIn PDF document text
    • https://cdn.sqhk.co/fagijopi/hbthaJg/recharge_prime_video.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/ha4TfMn/85895535812.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/9870078.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/dgnZrv2/xebivigox.pdfIn PDF document text
    • https://jotuxopa.weebly.com/uploads/1/3/4/2/134265841/a55ee9f3.pdfIn PDF document text
    • http://geleostone.online/lanafojajanijises3kf1w.pdfIn PDF document text
    • http://paktum.pro/different_kinds_of_academic_text_and_their_descriptionzo9a7.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/ee7aa4b3-b172-4ef3-a280-c33049c1a1da/garmin_vivofit_3.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_c868ee3fda674500bd6554a5cd3ab424.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a0ddd2-b9b0-40ab-8bd9-4853ecff11c0/piloziranapumalivevifava.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_62391b59e1104e2f9e03b64af4753f32.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_46f68aeea81d4f06a7f4a3145ece9b01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/779444dc-6b06-4df5-816a-e2a5eb794ef3/introduction_to_psychology_online_course_uk.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 5452 bytes
SHA-256: 372db673ef1530e83bf160a42174b6c20b1858e6b2ea1a5bad8b469625040f25
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 10664 bytes
SHA-256: ee303f8926f3fac8899a4c485151a3340346c22cfac6c4f2410e0de7f409a803

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