Malicious PDF — malware analysis report

Static analysis result for SHA-256 c821808228f3c393…

MALICIOUS

PDF

76.2 KB Created: 2021-02-15 18:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 9baf5ac2fda5cb74b105ff4af4cf723a SHA-1: ac393593a0e07ad991e3a7d8c7ee81c72b79aa27 SHA-256: c821808228f3c393e8df66dec6ecbbe418d45c8112fc6105e84bd1191c812341
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on 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 presence of embedded URLs points towards an attempt to redirect the user to malicious sites, likely for further exploitation.

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
  • 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://baarspo.ru/strik?utm_term=structured+computer+organization+3rd+edition PDF link annotation
    • http://novuzigekisev.iblogger.org/rovokatimerofidazimami.pdfIn PDF document text
    • http://italywom.space/xipenareluvo121ns.pdfIn PDF document text
    • http://copyright-infringement.business/a_b_c_d_video_mp4hj846.pdfIn PDF document text
    • http://keepmaxi.space/beats_wireless_earbuds_manualbka9b.pdfIn PDF document text
    • http://diduziwiti.22web.org/62578769424.pdfIn PDF document text
    • http://antinomi.design/jitikegifa41k.pdfIn PDF document text
    • http://womumonafip.22web.org/3444996217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496378/normal_60272ce0b8e11.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/jeGhdgg/70854123585.pdfIn PDF document text
    • https://cdn.sqhk.co/bitajububida/ifhgijO/how_to_make_origami_dragonfly.pdfIn PDF document text
    • https://cdn.sqhk.co/vepefilome/iafyifB/22757772966.pdfIn PDF document text
    • http://memexeti.66ghz.com/5929419771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kewakuko/327803983.pdfIn PDF document text
    • http://rawatakutuju.rf.gd/transformers_prime_arcee_deluxe.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/69409070753.pdfIn PDF document text
    • http://notewewagegev.rf.gd/pitc_kolhapur_cet_2018-_19_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 5384 bytes
SHA-256: 02f6995fa917f14886e1438215056126f13d093f280df6a25eabbe23e91ca5a9
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 11564 bytes
SHA-256: 1e5c50c102ee63a5ecea90f78b85f6145532a32c33623d9ae8523b37f6f4681e
font_02_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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