Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa11e65b82c65610…

MALICIOUS

PDF

66.3 KB Created: 2020-12-10 09:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c4f7a061bde1d5af849390c59917a4ef SHA-1: 5987ad0d0fdd1afe18be9913a488da405693465c SHA-256: fa11e65b82c6561010af9b69b3701262e8fdc455dcba0074abe1cff77e795ad6
222 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with a critical heuristic identifying it as a malicious redirector. One prominent link leads to 'traffine.ru', which is flagged for malicious activity. Another heuristic indicates a PDF link farm, pointing to numerous external PDFs, including one hosted on 'weebly.com'. The ML classifier strongly flags this PDF as malicious, and ClamAV confirms this with a 'Pdf.Phishing.Trojan' detection. The presence of these links suggests an attempt to direct users to malicious infrastructure, likely for phishing or malware distribution.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/strik?utm_term=hygeia+enjoye+breast+pump In PDF document text
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/da3ad342b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425910/normal_5fba7c125ebca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_5f9a0e98e31d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5fc182575b03d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_5fad7bdb2433e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_5fb31c66e12b0.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/fuzux_zinubowawifo_dajopasi.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/xejoxizuzife-xukot-ligoburoliduses.pdfIn PDF document text
    • https://mizazilat.weebly.com/uploads/1/3/4/5/134528341/dapinasinab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_5f99a343a063b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a019f65f-ae28-466b-ad4d-8bb850ff3b23/79962979159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec98ea6-c464-4f42-9fa9-e652ac95cb0a/dr._suzanne_humphries_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8d2f79-0994-437f-b5f8-7ee4477b73b6/os_pido_posada_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5640d11-356e-45e8-97ff-6d09e07c0de2/sobigenikivata.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_off0000c658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC658 5384 bytes
SHA-256: de7c0be7938efa49905cd2b93505c54e6da5ab0787ef0f3501b8b4329872538d
font_01_sfnt_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 10584 bytes
SHA-256: 7dd8ac30a33afba9afd2dc808522c29ae526922c56b68227638da7e9d041f27b

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