Malicious PDF — malware analysis report

Static analysis result for SHA-256 7349b0d85e624a54…

MALICIOUS

PDF

75.6 KB Created: 2020-12-28 05:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 41a04c70c19f0f62f7eae25b86ac4a62 SHA-1: dbe8349a2920785c25ce11270fae67f582912f95 SHA-256: 7349b0d85e624a54df4383900bf87f1f13437b045749fe535a8e96efccc93a7a
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious sites.

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://cctraff.ru/aws?utm_term=sales+administrator+cover+letter+template In PDF document text
    • https://semovililuf.weebly.com/uploads/1/3/4/4/134476677/zuloge_jozariwunani.pdfIn PDF document text
    • https://virigegeke.weebly.com/uploads/1/3/2/7/132740897/8291387d4.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/5PijOhe/83461343672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5fda69fd44d25.pdfIn PDF document text
    • https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/foremegometobo.pdfIn PDF document text
    • https://cdn.sqhk.co/nutakurij/iitouhh/82421667767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f8ae9de52ac5.pdfIn PDF document text
    • https://cdn.sqhk.co/wemofisejaf/ihMOXhf/dixometuzura.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/Sibifgj/como_usar_cabify_driver_en_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/3jdhfOK/21474475221.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/wemupajese/47534711392.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/lovagore.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_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 5168 bytes
SHA-256: 6561255023527ad6f4f2fc76d9da9621c6f92f4b9b6e57fb70e41575179dc25b
font_01_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 10156 bytes
SHA-256: 5ec53a131fbd91ff309b82a69cf8c978e89821bb237b3d750b2285add9694514
font_02_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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