Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28b4c20b36a04a1…

MALICIOUS

PDF

69.6 KB Created: 2021-02-21 13:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c46ad175615caef1d05ce6c450f26653 SHA-1: 1c3e8c699ae401f6ddbe1e6b0ff3757a0c207b70 SHA-256: d28b4c20b36a04a170afd2eedff731703e46a61bf378ab9f9321f8da7573b51a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded links are indicative of a malicious document, likely used as a lure for further compromise.

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 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://leonvi.ru/123?utm_term=how+to+use+bicycle+pump+presta+valve PDF link annotation
    • http://werenntaq.online/chhattisgarhi_comedy_ramu_yadavlkwlj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417990/normal_6024828ba1e20.pdfIn PDF document text
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/kajibiluxuwudum.pdfIn PDF document text
    • http://train-home.ru/vukasiwimn3ejt.pdfIn PDF document text
    • https://cdn.sqhk.co/naxokujim/dB5Ches/pocket_chibi_anime_dress_up.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_602164577c6da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_60253542a9524.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/dInhiTU/paul_hardcastle_rainforest_90.pdfIn PDF document text
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/fefuwejub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443337/normal_5fec87783a230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_5fc73801b91eb.pdfIn PDF document text
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/banav.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/grQ402O/tawukop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fce74328c6f4.pdfIn PDF document text
    • https://cdn.sqhk.co/fenajobuwer/Kghjjja/60317555078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niforubuduxema.epizy.com/vikigujosekoxoboditedidiw.pdfIn PDF document text
    • http://nogojituwizax.epizy.com/32585999972.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_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 5432 bytes
SHA-256: 1e3167955f26f33e856c1024d1aef5151f67b773dc2b0ac5d5bcf270d36f0102
font_01_sfnt_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 11132 bytes
SHA-256: c2e0aca489f57601cc438b35c533b6aa3638bc0a274fcb17807366e7bb93a3e6

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