Malicious PDF — malware analysis report

Static analysis result for SHA-256 10941c8dba131520…

MALICIOUS

PDF

69.8 KB Created: 2020-11-25 07:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0e9634a5beb48070df2e9fc2f1e47979 SHA-1: 75c6db78810e031dfc9326203dac3f184205649f SHA-256: 10941c8dba13152056e4caf81b2dc3e7310f57fd04c969ac3f992eb602d635e6
244 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to malicious infrastructure, masquerading as an internship acceptance letter. The primary malicious URL identified is `https://traffmen.ru/strik?utm_term=internship+acceptance+letter`. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=internship+acceptance+letter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f8dc83821309.pdfIn PDF document text
    • https://xilevaxe.weebly.com/uploads/1/3/4/3/134391777/wuwexafegawupo.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/066f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_5fba7a245a968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5f88213faa871.pdfIn PDF document text
    • https://vivorewipaxuje.weebly.com/uploads/1/3/4/3/134365477/5138785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f89aa0ed3cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5f908f9ae31f0.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/lanotad.pdfIn PDF document text
    • https://vufuvato.weebly.com/uploads/1/3/4/7/134718288/77ab0d4dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5f8d7f17a5972.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/13f81d65-a383-4bcb-912c-d19c97076f0a/wekemotibuxeni.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/nc_expunction_guide.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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 4956 bytes
SHA-256: f6be87a3e5c69b05d56baac12cecb5cac3101285c1a98264e1cf0697c920f596
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 10724 bytes
SHA-256: ed652dbf3321038e0c8270a2a05295bf28ae53713aa572656329f040ade9ee73

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