Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3684c57e85b442c…

MALICIOUS

PDF

102.6 KB Created: 2021-02-19 15:27:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8fe7c37587fd3138d259ff271224d478 SHA-1: fb0b4c545d0f99259535f7983655ade8bfc89b99 SHA-256: f3684c57e85b442cf6f28d2148384f01ab3d416294f88f556ab62cdb63cf4aad
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 potentially malicious redirectors or link farms, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'Skyrim mage build tips' and application metadata, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/strik?utm_term=skyrim+mage+build+tips In PDF document text
    • https://cdn.sqhk.co/kogujipubap/oMjf6Ja/green_bean_casserole_with_bacon_and_cheese.pdfIn PDF document text
    • http://betflixguvenilirmi.com/86337983764e1rlm.pdfIn PDF document text
    • http://stickerrus.ru/what_to_put_on_resume_for_skills8o9rd.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/duiix5j/mens_hairstyles_long_on_top.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_6012421b13ccf.pdfIn PDF document text
    • http://ashotik.space/thse_en_bretagne8plaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448357/normal_601b847f55f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_60210fbd9401c.pdfIn PDF document text
    • https://bixixadapi.weebly.com/uploads/1/3/5/3/135321875/navimaluwuzu_fawevajigo_foreroris.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/voxulija/18522158248.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/43666156608.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/audit_process_flowchart_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/fuvugoduwisem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14466 5356 bytes
SHA-256: 40642af2f960bf92b5c892dc9cc8bb71455897fca3f2716c3d478b82831cb15d
font_01_sfnt_off0001569a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569A 12024 bytes
SHA-256: 5dc73233f9ead77bf7bfeef5169464a9c3579a9c5d84f599d170f19ce74d178d
font_02_sfnt_off00017f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F3C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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