Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52af0eb625eebfa…

MALICIOUS

PDF

68.9 KB Created: 2021-05-15 14:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ef8c03106146a9381eb3ba7cbd92504d SHA-1: 71814f7301fe59e0917f4df206479ee44a6b6409 SHA-256: c52af0eb625eebfaa731c6cd663d9e8dfb92a3f2dc11f0de9526d4e6d6210dad
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/strik?utm_term=sims+3+world+adventures+download+for+mobile In PDF document text
    • https://cdn.sqhk.co/jomutepe/2jjghJz/darisufogevokanijup.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/76440750417.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/66405597643.pdfIn PDF document text
    • http://fotobaruti.22web.org/calgary_jobs_information_technology_manager.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/jRhjuie/zezabanilepikosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_60554c9f953a4.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/hee1if1/descargar_dino_tamers_jurassic_riding_mmo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_6036bf5ec35d8.pdfIn PDF document text
    • http://xonewidenutubo.iblogger.org/how_much_does_a_baby_gate_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_601c6066e28f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450430/normal_6008eee0a817b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_6024ad5961d92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_c16c22d933744fb2a61d2f2d8edb1e6b.pdf?index=trueIn PDF document text
    • http://mimodiko.epizy.com/monster_incidents_anime_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c957d1ff-c708-4716-a60a-bbeae7095369/tegabijesazidekunekiju.pdfIn PDF document text
    • https://e222b685-7c7f-4cee-b050-218328c89257.filesusr.com/ugd/c0232f_4fa127135c7a43bc9eb2362ca9a2a9e4.pdf?index=trueIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_a9b844ad018d4c27acb5c6d032e96e00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/862d7ac6-5708-48b3-a78d-79dc93d1b39b/4_pics_1_word_daily_challenge_bonus_puzzle_answers.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/steuererklrung_anlage_n_2020.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/zewevafumopalutixosijote.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_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 5612 bytes
SHA-256: fadaf9d0441bd5016ec9135f2589d1604c0b5f15a49f4b4684c7164b74226656
font_01_sfnt_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 11304 bytes
SHA-256: bf8398a4a9fd44ee8b354f788b0b2988951a7adb17ace5598d46901026809918

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