Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd8aded8444a8f6…

MALICIOUS

PDF

64.6 KB Created: 2020-11-17 16:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d05d29452ba35bcf8d6ff515d281d4f9 SHA-1: 3fbfe2865c3dc6abf2c3befdac1e1f9b7a5f6acc SHA-256: ffd8aded8444a8f628725fc54b82622960bbf75488b4ab1371869d691d104696
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or link farms, indicating a phishing or scam attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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://cctraff.ru/aws?utm_term=google+forms+and+google+sheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f8718b73f4b0.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/nulesowatixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f906977da10a.pdfIn PDF document text
    • https://matasomorat.weebly.com/uploads/1/3/4/4/134492922/3bbbcc5cd1403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_5fa350a0d1c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_5f9860fb5c725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_5f9d64ccc1a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_5fa90e2f52d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_5fb0250a9b2d9.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/bakoloj/app_itunes_download.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/brand_equity.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/rug_doctor_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/vejojodokugugidivusivude.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_off0000c05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05C 5352 bytes
SHA-256: 9ea5d13a5cbb9b3cf5748e6dbf335cb5ae254defd95d97004518c3211a72d42e
font_01_sfnt_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 10340 bytes
SHA-256: 16f70c5227c0900dbc818039e7b35f374108e8257a336135ab2d14d4df0275cc

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