Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef1f465bbb2d301…

MALICIOUS

PDF

81.5 KB Created: 2021-02-14 01:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 80d016106f2b47df602d7bb0b98b6a4a SHA-1: d1312bd8cc136df0989a8b0104b4bb3565f081c2 SHA-256: 2ef1f465bbb2d30155db69ddb19f4ae4345b1707bd502b3680e242758ac50e31
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document that contains numerous links, including one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded links suggest an attempt to redirect the user to external, potentially harmful, content.

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
  • 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 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.
  • 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/123?utm_term=art+history+volume+1+4th+edition+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4416798/normal_5ff7583c047a0.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/sikukoksl50c.pdfIn PDF document text
    • http://trokot-shtorki.online/3706291347n53iw.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/lomikiteba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5fd0586420393.pdfIn PDF document text
    • http://baffer-shop.space/serenade_of_water_piano_sheet_music7tn9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_601418077d107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fcad7859f69b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_60083854aa46c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469630/normal_5ffa0f7959404.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazemi/geog._3_4th_edition_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/tinugokesifosawuximokuso.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/us_navy_khaki_dress_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/addendum_email_format.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_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 5364 bytes
SHA-256: 6dbbb2a65fe3dee16e691dfdd6916456b5c07e67b31536f660426d94f63230f6
font_01_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 11300 bytes
SHA-256: 05966b11aa5e9736545b275707ca6494789a8c5e509583c6cfb196c72051f81d

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