Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ad3745be46e562…

MALICIOUS

PDF

97.8 KB Created: 2021-04-03 06:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fa0c39cd4dd1d993d5d824f584a94859 SHA-1: b3fcc9750e1c5abebb12f75e16c923c30cd42b03 SHA-256: 64ad3745be46e562ae7dd324f753f988d8cf6f0c76df1e8e3da3827eb706c874
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=how+to+do+the+shadow+possession+jutsu PDF link annotation
    • https://cdn.sqhk.co/tozegatopaxu/IjfNJYO/how_to_mix_acrylic_paint_to_make_brown.pdfIn PDF document text
    • http://outputqwvk.space/70590311730zueel.pdfIn PDF document text
    • https://bovusobovazova.weebly.com/uploads/1/3/4/5/134596491/momulasomu.pdfIn PDF document text
    • http://repair-foto.ru/ielts_speakingov9sj.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/lyQvKhh/acca_f3_kaplan_exam_kit.pdfIn PDF document text
    • https://nidukonijeso.weebly.com/uploads/1/3/1/3/131381088/benanakir.pdfIn PDF document text
    • http://gunotuje.iblogger.org/wildgame_innovations_trail_camera_3_pack.pdfIn PDF document text
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/3397666.pdfIn PDF document text
    • http://frukt.fun/joxowuzosifed6o3e1.pdfIn PDF document text
    • https://cdn.sqhk.co/lutidofele/gOGijhY/childrens_spiderman_costume.pdfIn PDF document text
    • http://olipaka.xyz/let_it_snow_song_piano_sheet_music6tdan.pdfIn PDF document text
    • https://cdn.sqhk.co/zijatiki/agijhhj/ditixa.pdfIn PDF document text
    • http://igafnd.org/28796139014vof9y.pdfIn PDF document text
    • https://welafunugor.weebly.com/uploads/1/3/5/3/135327357/1788433.pdfIn PDF document text
    • https://wusoditada.weebly.com/uploads/1/3/1/4/131406121/353cb0e9874.pdfIn PDF document text
    • http://gufolitif.22web.org/bukuferewelivajapogevope.pdfIn PDF document text
    • http://gofipupeseg.22web.org/fill_in_the_blanks_with_articles_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bonizigajivoxi.epizy.com/toro_personal_pace_lawn_mower_parts.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_f6afe7933aac47a59a026a5d7f6adbe5.pdf?index=trueIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_ede8eef281904d7e9216554621b46c72.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_470a37fa93a44d318b66ffdfcd8b5704.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 19484 bytes
SHA-256: 3272e686cae6f3b27904e99ce0d78e270ce5daa0ed59c41a421951416992bf93
font_01_sfnt_off00014289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14289 5048 bytes
SHA-256: 6e67cd1803c10ec135a866e35c794619570ec8ea471bbeb7c03c58900d10d845
font_02_sfnt_off000153c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C3 11096 bytes
SHA-256: b2310dbe83da5d861c840a9cc9ccfdd05238799b583d413766aae4a75853adb1