Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5fd3b5ade8f33e…

MALICIOUS

PDF

72.6 KB Created: 2020-11-14 02:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 28d33ea9299ba1b5166dc8f56c0943b1 SHA-1: 9898149e7a2a9dc26f7a5732683fb78d45f27c15 SHA-256: 5d5fd3b5ade8f33e54b1ca73d5145d3941223d692c012613d1a9712e1aad5b95
214 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded links, many of which point to redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that these links are intended to lead users to malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this file. No scripts were extracted, but the primary attack pattern involves leveraging embedded links for redirection.

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://traffmen.ru/aws?utm_term=decimal+place+value+expanded+form+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_5f931f6e63a85.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/2300220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f925148ea1d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f8d3a8d28c12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5f9193b6ebf7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_5fa7da76ef81a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5f99e877a0611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_5f962bb8dcf79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_5fa2f3027b71b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5f8b3a594cd41.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/fujadabez/xuwiwalegazopilozumekano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85afc07a-d359-4497-88f9-84119bf538af/puzzle_and_dragons_hacked_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad534f9d-a5a8-412b-8300-3e60612503c9/nexelitowur.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/vosalawuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f037bf2-53e8-4c48-9978-56836b92f4ad/valawegapo.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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 5680 bytes
SHA-256: d8fe3fd3ab4b1b2f6a85713aea58e7d65d00d378e996efcd3f1050ce425bffed
font_01_sfnt_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 10400 bytes
SHA-256: c44b17ad1c8f13cdd647f7d0f01b23bc07aee2222763799e94d55eb2f45c7589

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