Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cda32eb498c8c2…

MALICIOUS

PDF

69.1 KB Created: 2021-02-17 16:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2f6c60d09cc728c5cdb23f398b26266a SHA-1: ab04e30d348dad16f392241a34312c9763d925cf SHA-256: a5cda32eb498c8c2dcfc30777875f5c7d8fb176c504ceda3e7b58b31252c7d33
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded links, such as https://yafferge.ru/aws?utm_term=roland+juno-ds88+synthesizer+review, likely lead to phishing sites or malware downloads. The presence of numerous PDF links suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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
  • 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/aws?utm_term=roland+juno-ds88+synthesizer+review In PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_602c916e7a586.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/3OS1ice/15425126026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5fe6cfa8455d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_60198fd713428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_602ca7969989d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_602c8a333b0df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_6005eb2583160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_60081f20b351f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386836/normal_60099c032ed8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479684/normal_5fc9f9783d77a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404964/normal_6004a71f9f7bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445331/normal_5febc652cb919.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/dkVVMhe/zakodupisunijuf.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/1839665.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_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 5524 bytes
SHA-256: dc53ac756cc8340b04344bdd448690de80ff229d88e0e7e67153acd3df5f79ec
font_01_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 10656 bytes
SHA-256: 48e5c472084455c22e40d4200d7a2be5cb8b2d393521d44910bac5ff78d2e775

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