Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83c04058c39c9d4…

MALICIOUS

PDF

63.9 KB Created: 2021-04-04 04:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2b984257f0806a92a6df16dd337bb660 SHA-1: 55bc1651ce1601141395050ffdb1bb5ae334bda8 SHA-256: f83c04058c39c9d45c210dfb0e1ad3bc41b44be47cfa1aaabbc9715be321ff80
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=bella+casa+bed+sheets+king+size In PDF document text
    • http://botomovosisivod.22web.org/52044278257.pdfIn PDF document text
    • http://idealsit.fun/angular_admin_template_open_sourcedifls.pdfIn PDF document text
    • https://zumaraje.weebly.com/uploads/1/3/0/7/130776401/853a5.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/google_local_guide_hotel_perksqyfvt.pdfIn PDF document text
    • https://jezisivakutuxek.weebly.com/uploads/1/3/4/8/134862078/2cf7102.pdfIn PDF document text
    • http://kzrovk.xyz/takufuzejdza8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wanigag.rf.gd/biometrics_journal_latex_template.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_adf5198be16342739353c00e37ee0a1a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/68801165475.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_17077b122f1643a19f320f7b17fccbef.pdf?index=trueIn PDF document text
    • http://vimitafukufes.rf.gd/antibody_screening_test.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/54415884242.pdfIn PDF document text
    • http://bevelidokubisop.rf.gd/kalabhairava_ashtakam_lyrics_in_telugu_free_download.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_90207977ec814047ab7f22a071e5678e.pdf?index=trueIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_4b41071a1cb14b34bdc7a1686cc5f2a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosego/ps_vita_pch_2001_vs_2000.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_4d2b6c41d5b64bf2b102f3eef57e5709.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8F 5408 bytes
SHA-256: 8ca92df0fbbd554e3c55d32b41d908fc9fe5afeb610b55ec5e7adb4280ae6d17
font_01_sfnt_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 10472 bytes
SHA-256: 00f5e95c54c55da7eb007379f9ce76d544d1a62cb0fc179956c4f66f7add8df7

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