Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b1bd651ee8247f…

MALICIOUS

PDF

96.6 KB Created: 2020-12-02 05:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0d0cf7cc82c5e0de5f253f1436b529ea SHA-1: 15d8f81994bb22972d5da1dab9227a7f1a8cb99e SHA-256: 11b1bd651ee8247f207284758e431802385731e7d51e01533e95f5fa95ac5301
214 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which in turn leads to a link farm of other PDFs. This behavior is indicative of a phishing or SEO poisoning campaign. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=paradise+lost+pdf+summary In PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/160d49b.pdfIn PDF document text
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/letatow_livogo_noxuzalepuvu_risovajin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5fc33bb4ade30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_5fa1ee77553da.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/0587836ab908b8.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/3e298061-6a85-4f59-9dff-0fab6c681995/90389885443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd9e895-35d2-4e74-bb9b-5d461a699f59/vilemelebaloro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6879ae58-80c6-482b-8de9-cd8a5a4884e1/95820312927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1561c7ba-3047-4fc5-9fb8-bea493a34468/13153495222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac4e623e-bbd9-42da-b2e0-bf3b7b223492/vusosapekumuwawifowolijuv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ecedbf71053ccb1052a5/t/5fc57a2e1972c46e3c58cd56/1606777393655/kekofenamaxekavaganoxu.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_off00013cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC2 5288 bytes
SHA-256: 14c593522477478b5019510c1f8cd5725728b6a0574ac4ff499eda2798608ce8
font_01_sfnt_off00014eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB4 11820 bytes
SHA-256: 5c930e1d7baa6ac310f8d72b234dcd59490f6281b97a1390b0d4a677557ed583

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