Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb353d74da965ac…

MALICIOUS

PDF

88.5 KB Created: 2021-02-21 11:37:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 285faedcacc2e391a92a27beae94227c SHA-1: a355628715b5ffd53115bbb8c50eb7e10a9960b1 SHA-256: 0eb353d74da965acc4a5ac020e669aa361e45eb30caf677e8a060499223d774e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external links, including a link farm heuristic. The primary URL points to a domain associated with malicious activity, and the PDF structure suggests it's part of a larger SEO manipulation or phishing scheme. The presence of multiple external PDF links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=multimodal+deep+learning+ngiam PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457281/normal_5feb84ad35a91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5fcb39ab266f8.pdfIn PDF document text
    • http://appless.space/kizewolawodefatalavewrp7k.pdfIn PDF document text
    • https://jikabokuw.weebly.com/uploads/1/3/4/6/134658058/4843617.pdfIn PDF document text
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/supofim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407788/normal_5fe0fde11d957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370278/normal_600896107c61d.pdfIn PDF document text
    • https://dakusarifupufa.weebly.com/uploads/1/3/3/9/133997242/180b2feb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_600d2b9985e61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_600f8d9a31154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412158/normal_60071e0416e2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5ff42d438af67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494430/normal_5ffe0b455533e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449987/normal_60214d539a3ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487413/normal_6005c81119ebb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/rerinago/20879944531.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/42746937609.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 5104 bytes
SHA-256: f35f772b82986afc9977fd68c289dd85acd912b22d22a8ce966f0390ae1f857e
font_01_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 11348 bytes
SHA-256: 4dde40fadbc994fea3a3f435cf55b2ee6fc58140caa0997a926b8e04c1a35043
font_02_sfnt_off00012dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCF 11268 bytes
SHA-256: 2f4582dc9de236ac8a34507d6933f1934838a5b95eae2134e1caa10b27fe03ab

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