Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f4eeaf65820bab…

MALICIOUS

PDF

67.4 KB Created: 2020-12-22 11:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 633782a126e1b282e5a8e12d7ebbbdcd SHA-1: 795f6fd8e48e81dcdaeafc76a9689da93fecb18f SHA-256: 52f4eeaf65820bab8fd745272ffccc86de79877e7e9ecc357e488ed9a0227a24
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to suspicious or disposable domains, suggesting it functions as a link farm. The primary malicious URL identified is 'https://gettraff.ru/strik?utm_term=itopya+musteri+hizmetleri+sikayet', which likely redirects to further malicious content or phishing pages.

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 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.
  • 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.
  • 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://gettraff.ru/strik?utm_term=itopya+musteri+hizmetleri+sikayet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fcb7812565ba.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/konazumobifaw-vigureno-mosigokanis.pdfIn PDF document text
    • https://vureduvo.weebly.com/uploads/1/3/4/5/134513064/214885ccf6c7042.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fccce44c7589.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/9938143.pdfIn PDF document text
    • https://pulipelese.weebly.com/uploads/1/3/4/6/134686308/2883946.pdfIn PDF document text
    • https://folokevoz.weebly.com/uploads/1/3/4/6/134682310/4045828.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdff99b3fde9411a280964c/t/5fe08d0251a86c1b6c561896/1608551683357/rizevojapataxuwisokituz.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/las_cruces_public_schools_calendar_20-21.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a394239b0722913c6c92/t/5fcb77cda3bc3d19152ee5b7/1607170016722/29829685298.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bcfb2e537a05ef083615/t/5fc963b4cd60ed0312135323/1607033784235/latigo_romano_jesus.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/56710740589.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_off0000c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC818 5212 bytes
SHA-256: 2cfa1cf6eb675faa84909c7e86eda448acda9312b855639b49b71c3cf17a057b
font_01_sfnt_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 12048 bytes
SHA-256: dd2e5d8d159a0c76a87658cccb22feaa793db24926633239ebbf24d999deeffe

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