Malicious PDF — malware analysis report

Static analysis result for SHA-256 47cf78439a5bc594…

MALICIOUS

PDF

81.7 KB Created: 2021-02-12 05:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9f3d4bb9d26b37cf20b3f4379e31cb38 SHA-1: 36fcadc1cdac7852fd8677319e2ac7f36b82f464 SHA-256: 47cf78439a5bc59438f3d25cdd15cbfd3d76fa0de909afcc69dc28c28544a6fd
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable or associated with link farms. This behavior is indicative of SEO manipulation or a distribution mechanism for potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://crophysi.ru/wb?keyword=alkaline%20earth%20metals%20properties%20pdf In PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/7546584.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/7405972.pdfIn PDF document text
    • https://tudogevu.weebly.com/uploads/1/3/2/7/132741144/wuzamakadidugetumogo.pdfIn PDF document text
    • http://abanca-electronica.com/fraikin_group_annual_reporty5uje.pdfIn PDF document text
    • http://gratoraama.website/vapafefuwamizasowq1inf.pdfIn PDF document text
    • https://nuvawusop.weebly.com/uploads/1/3/5/3/135302159/besiwidopuguza.pdfIn PDF document text
    • http://7lessons.fun/lipojobonejazubifeberirlrzd.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/naridunir.pdfIn PDF document text
    • http://pafugiwerokamez.iblogger.org/apple_blossom_white_stripes_piano_sheet_music.pdfIn PDF document text
    • http://smartbright.club/automated_manual_transmission_works7xnzu.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuxutagisu/pzjiyig/zelebevulebu.pdfIn PDF document text
    • http://termometr-medikal.site/30975303390nc7b3.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/f0ieQtJ/one_punch_man_season_2_episode_13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonujepurixadal.epizy.com/27321801868.pdfIn PDF document text
    • http://mujixexebekipan.rf.gd/sap_hcm_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/doranijuluwazudizukesod.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_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 5336 bytes
SHA-256: 9bf4264bc0b93b438c7cf6b5890ee88cb7e6d1ed7d8c87c40182dec1313bbc04
font_01_sfnt_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 11280 bytes
SHA-256: 3a631f75dd195b1757676df06aebd348d269257bda617c705161763181a1edc7

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