Malicious PDF — malware analysis report

Static analysis result for SHA-256 8592c63ba1107942…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 16:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a70d178e673916006b1157cfc9e198f3 SHA-1: c0fc52d688b244b3849ddb6ff083d869b5599809 SHA-256: 8592c63ba11079426c28867bae86e1d7dd4e11344cab75d82f357aaa16f8cb0a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to the URL https://yafferge.ru/wix?keyword=cooking+mama+apkmonk. This URL is flagged as a known malicious redirector, and the heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates it's used for free-download phishing. ClamAV also detected the file as Pdf.Phishing.Trojan, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=cooking+mama+apkmonk In PDF document text
    • https://cdn.sqhk.co/norejasiwiza/suXtGhb/6178975713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491933/normal_604f20ab80543.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/hgiiihQ/jezemelekulosametitivado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_60372b28a6204.pdfIn PDF document text
    • http://xomuxeje.22web.org/100_words_a_college_student_should_know.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/jghhhcb/beat_maker_software_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_6032b8090aaac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_60122c6c67454.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/Jpha5hf/venipini.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/dmWMjeY/chapter_10_dihybrid_cross_worksheet_answer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_602a51542e9fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://weralawubuzeg.epizy.com/eos_80d_manual_focus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4e950e-0972-40d8-9c4e-19a8ab3d7a6c/what_does_cardiovascular_drugs_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/497214cc-314a-40b3-b0c8-38d5804dd8a8/how_do_you_reset_your_voicemail_password_for_verizon.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/89327648188.pdfIn PDF document text
    • http://jupuzagap.rf.gd/50580245792.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/1861633799.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/makita_plunge_saw_with_guide_rail.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/tedekarojunonoxudo.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/kofobubobexemesulogizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aab1972-1aef-47f3-b84b-6f41febcd2ae/rizutosovipubovusalaw.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_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 4804 bytes
SHA-256: b9520c8a594737e8fbcb94b1fcbf62c9f19716914b39557643ff62ae5d3b24c9
font_01_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 10760 bytes
SHA-256: 30aaea97d09dd78c97696d0fbaa5053745bf85bcb61bb47327d5e36749e16e2c

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