Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3779ce0ca1cfa8…

MALICIOUS

PDF

78.9 KB Created: 2021-03-06 18:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: eeb5f31d66f62f750cd2b5be451c789b SHA-1: 78549fbb905e7b5746a5dbd073bcca15df5849b1 SHA-256: 4d3779ce0ca1cfa89fd8a1a3233331a766e86f3836f27603180b20bd9f7537d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded links, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The ML classifier also indicated a high probability of maliciousness.

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://botokaw.ru/123?utm_term=will+my+ps4+bluetooth+headset+work+on+ps5 PDF link annotation
    • http://talakam.space/291545869493ihei.pdfIn PDF document text
    • http://hookup755.fun/teacher_evaluation_form_sample5emxm.pdfIn PDF document text
    • http://csxmoney.info/julius_caesar_play_characters_listqijfz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fffd9b5aeeaf.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/lumuwek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_5fd18bf34bce8.pdfIn PDF document text
    • http://grizhoff.ru/onedrive_android_sync_problemlqq8r.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/tazupidib.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/23738972468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_60289e1915854.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/how_do_you_play_stacking_cups.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_602a6ffed28f7.pdfIn PDF document text
    • http://usejus.club/massey_ferguson_165_parts_diagram6jibi.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/pocket_icu_book.pdfIn PDF document text
    • http://chuvashovfamily.ru/clash_of_clans_gems_coins_and_elixir_generator12qvq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_452a8973f5ca479688e576eccfc97d75.pdf?index=trueIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_e4df5a58cd0f4aadb65b4aca63459873.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_67ffa45bfe4b45e38c85fe93e2107a8d.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_210f25d99a15485189ec6b7e39b75ae7.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 5824 bytes
SHA-256: 34bef7f93caea1711f9f76ca8824a94ec08b4ded4a3e810ace989f4e2ff76f9e
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 10412 bytes
SHA-256: bfdc3668dae0ccd207460623606a21583a0253716c57d7c4458e554c257b3325

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