Malicious PDF — malware analysis report

Static analysis result for SHA-256 375135c60eb80d8b…

MALICIOUS

PDF

65.7 KB Created: 2020-12-21 14:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0c909a2fc69281aedc45d299d13ee3f1 SHA-1: 7372090a3fea639e8afa4dbe4a01241db6c311e7 SHA-256: 375135c60eb80d8bbfc63f04108bbacbc65529316834cb20818d1745ea2b17c5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate this PDF is designed to act as a link farm, directing users to potentially malicious content or phishing sites. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=greatest+hits+of+the+60%2527+s In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_5fa9d4f2cc90a.pdfIn PDF document text
    • https://sizonijuza.weebly.com/uploads/1/3/4/5/134594560/sedaguvabujogozote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_5f9f1edd9b5a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_5fa06abc2437b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5fa7538bc32a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5fc8f8e9c09cc.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/5ac69e2b-8b4c-4e86-a308-87b99349dff6/fagilojotaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ca2bac-3135-473b-a797-5d97f7d0cf68/77545874405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4b6747-b808-434c-b007-041abd7697ed/sub_hand_receipt.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66aa09698b02c7f467a67/t/5fcd3b20c00f007ceaf3bee8/1607285537071/funny_videos_of_dogs_and_cats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7a10fe-8416-4a6b-847b-60ef5c6cb350/gafoxetotosod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5da53485235c86bde238/1606376871383/information_technology_reviewer.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_off0000c535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC535 5184 bytes
SHA-256: 4e8f8df49ae4922435144f9b6e4632732b83399915c92313e63e38e16ef595f9
font_01_sfnt_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 10396 bytes
SHA-256: 88c97ea1ecac3ac6b3c15e8a3298bbe8929574ed42d6e0fbab661057d8715f88

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