Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f408b74054b1c1e…

MALICIOUS

PDF

74.7 KB Created: 2021-02-12 03:05:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf1410b6ba83a2cbe50a919c09801a3c SHA-1: a635440c3548dd97b3a09b11c150321947b8664f SHA-256: 4f408b74054b1c1e57040ce7d1509fed461c268cc735b3a034ee82b8b3a6a7e1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

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
  • 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 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://yafferge.ru/wix?keyword=higbee+mo+funeral+home In PDF document text
    • http://1-bog.ru/20613855853aj60d.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/xuraduzepafeda.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/YhbjjSN/i_love_crosswords_2_level_19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368266/normal_5ffded17a8ffa.pdfIn PDF document text
    • https://lexapokugivida.weebly.com/uploads/1/3/1/8/131856754/5d31d00d45bdb9.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/nujen_luduf.pdfIn PDF document text
    • http://bioforcecolumbia.site/aao_de_exigir_contasf9ntm.pdfIn PDF document text
    • http://workbykoder.xyz/divofudukawozipetedzras4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiwularofevomu.epizy.com/autocad_architecture_2020_tutorial.pdfIn PDF document text
    • http://megoger.rf.gd/deewana_aisi_deewangi_hd_video_song.pdfIn PDF document text
    • http://dazigeles.rf.gd/danse_macabre_piano_solo_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/example_cv_templates_free.pdfIn PDF document text
    • http://verepuremi.rf.gd/sasepixarupiz.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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 5104 bytes
SHA-256: 61144270d3e4c73336a55329188c45d9d32fe18b892845b6d13bb960a67d4334
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 10224 bytes
SHA-256: 4e02cb2d35c7a4d543f6b06850b7fb2b074654671e168cbdb0dadb1a9f40ae99

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