Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f631e15d8bea44…

MALICIOUS

PDF

79.0 KB Created: 2021-02-10 08:27:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 30cd0d08f3c0a7210bacdd452fb2cc91 SHA-1: 2bb71b2a276f04002c11bdf4c76210b283bad125 SHA-256: 55f631e15d8bea44f5f943655ba5a23bdd9c4cd03adebcc6602be6f47bca9ae7
156 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 Weebly and S3-hosted PDFs, suggesting a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/aws?utm_term=critical+care+medicine+journal+guidelines PDF link annotation
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/4498418.pdfIn PDF document text
    • https://davovexo.weebly.com/uploads/1/3/4/3/134355956/reguxibupewoj.pdfIn PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/farilipip.pdfIn PDF document text
    • https://nesaresivegixan.weebly.com/uploads/1/3/1/4/131453215/d09654e9a8b1.pdfIn PDF document text
    • https://tubuzitobez.weebly.com/uploads/1/3/4/1/134108618/xutijid_midafal_wafanibim_metalinosuwo.pdfIn PDF document text
    • https://ganalazukomej.weebly.com/uploads/1/3/4/7/134714395/bozela.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/72013414887.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/batman_arkham_city_ps4_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/94674249145.pdfIn PDF document text
    • http://xirokigekokumar.rf.gd/zuvatagefu.pdfIn PDF document text
    • http://fobajoruvibu.epizy.com/pafaresufe.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/decibel_x_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/gekadetabiwinovelokotefoj.pdfIn PDF document text
    • http://bibarixe.epizy.com/boy_picture_frame.pdfIn PDF document text
    • http://diwomikutaz.epizy.com/5th_grade_math_worksheets_division_word_problems.pdfIn PDF document text
    • http://teguxivufir.rf.gd/picsart_background_picture_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/galway_girl_sheet_music_violin.pdfIn PDF document text
    • http://zapofekeba.rf.gd/jingle_bell_rock_sheet_music_d_major.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 5240 bytes
SHA-256: 11787a35298a479a42754c6736aeada765f9ebc5580fc19722ed8a8248f803e1
font_01_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 12460 bytes
SHA-256: 463065ea0aa13791d58fcc6588044cc05fe23607f6b59f9a4e8e9ba8b01106a9
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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