Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b3861f2ced10aa…

MALICIOUS

PDF

75.4 KB Created: 2021-02-17 11:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d1d764995c9f3d8c326b8f90bed78ec4 SHA-1: 6323301f8e08d5e035968302cc2287833cb43bfa SHA-256: 21b3861f2ced10aa71efcf762bd9645f328becc7c24cad65d3e7c04618d4072e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and one specifically flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://seumenha.ru/aws?utm_term=why+spray+paint+won%2527t+spray PDF link annotation
    • http://keksik24.ru/bts_love_yourself_answer_fontik552.pdfIn PDF document text
    • http://tuzurew.iblogger.org/pleomorphic_adenoma_malignant_transformation_rate.pdfIn PDF document text
    • http://imkl-checker.com/background_ppt_yang_menarikrnsm3.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/d262d4544.pdfIn PDF document text
    • http://faguduni.22web.org/rick_and_morty_copypasta_template.pdfIn PDF document text
    • https://lexobazotukagof.weebly.com/uploads/1/3/1/4/131407042/9bbe6219d5f60d.pdfIn PDF document text
    • http://vorgazme.com/49891741257v2fzh.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/3919722.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
    • http://nusotewepujura.epizy.com/adobe_professional.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/genobujujivaxuwezoravur.pdfIn PDF document text
    • http://jojomuge.epizy.com/3d_city_car_driving_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/blank_handwriting_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/59210218764.pdfIn PDF document text
    • http://jufosuliz.epizy.com/cleanline_surf_report.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_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 4784 bytes
SHA-256: 3640482434008f4cd040149855d33e5e6e373eda26b76cb91a5afa2f8c8e5bad
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 10140 bytes
SHA-256: 92f5e1633dcf9d1fbed6489ec27ccfe33d18d53006a12a2002fcc5069de7c945
font_02_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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