Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2cda154bf60cf5…

MALICIOUS

PDF

66.6 KB Created: 2021-02-15 09:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: f1c3f5d2e0e965787cd1119f8ee16018 SHA-1: 4c7339c1e54a254a30c61a2b08b7abc94beb96a3 SHA-256: 4a2cda154bf60cf56b9258134451decced5bd1ec42af2af9d67aa5b2c006148f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a 'link farm' by heuristics, suggesting a malicious intent to redirect users to potentially harmful content or for SEO manipulation. ClamAV detection and ML classification further support its malicious nature. The embedded URLs are the primary indicators of compromise, pointing to a distribution or redirection mechanism.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=social+media+marketing+plan+definition PDF link annotation
    • https://cdn.sqhk.co/fimegasaz/ijbgggj/soda_dungeon_2_scripts_miner.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/dibuvezi-suvekevaruj-xovebolebesefob-patepadoxil.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/xusakuvonagexo-fololerutoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367296/normal_5fe0fe2d982a7.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ijgfijz/hat_trick_century_in_test_cricket_bangladesh.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/iagejjK/wimejojaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fd62518e5bcf.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/WgcsSli/wheelie_challenge_crazy_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446942/normal_5ffb227b31aea.pdfIn PDF document text
    • https://cdn.sqhk.co/xowoluve/Gxqhhgc/ps4_emulator_for_pc_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvutose/P7zdbjf/76904176644.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/j08ESgj/basketball_stars_unblocked_games_ez.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/gibiedt/lit_romance_fiction_books_2019.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/vobekina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385231/normal_5ff28ecc1f639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374521/normal_60024c1d22f02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_600132a29765e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 5464 bytes
SHA-256: 522ec9b1bc1c55b0d667d65eb32ef70000866cef51b430668b7b99d879919be2
font_01_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 10112 bytes
SHA-256: 85a5962ed45697eae9342311ae4a2ac139d876768f63550f961c7d2e6026116c

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