Malicious PDF — malware analysis report

Static analysis result for SHA-256 857e4e74b002581f…

MALICIOUS

PDF

73.7 KB Created: 2021-02-23 00:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 39b925935f027b8520cdd7208c95a047 SHA-1: e2c76c7f0ce42ef78598000ce934520069233372 SHA-256: 857e4e74b002581f9147ebcfe531b7032cb44cfa286d13c69b1eee502bf189bd
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=t430+battery+price In PDF document text
    • https://cdn.sqhk.co/raxipopu/fjdic7v/fox_adventure_game_2.pdfIn PDF document text
    • https://cdn.sqhk.co/wigetoxeveka/fOuNujb/birthday_cake_images_mangesh.pdfIn PDF document text
    • http://edaruzal.xyz/2181341119j9zdx.pdfIn PDF document text
    • http://kfcrabota.ru/2540769596pzsj.pdfIn PDF document text
    • http://smeh-mif.space/magnetism_practice_worksheet_answersqkkut.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/bewalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485576/normal_6005ec3e0469e.pdfIn PDF document text
    • http://letgtma.bid/imperatives_exercises_with_answersvvqfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_5fe7dc18c099f.pdfIn PDF document text
    • https://pekamadepo.weebly.com/uploads/1/3/4/3/134321673/rejixapenetuni.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/mini_militia_ghost_mod_apk_download_free68yuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/rimawoser.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_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 5300 bytes
SHA-256: f707de21e27bcb32885f48645240dacab25aa5b0ede551724d4133cb107255b0
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 11564 bytes
SHA-256: c51dfd2633e05e05d0441ab2ec794299f66314f58786f9846518470b6bc358a3

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