Malicious PDF — malware analysis report

Static analysis result for SHA-256 7413f10a2af6ee84…

MALICIOUS

PDF

71.6 KB Created: 2021-01-13 15:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5c74c99183bf401c104f35360d34de0d SHA-1: 70e0202ef3ad39d646e9133372fdf274a920aa4e SHA-256: 7413f10a2af6ee84fb7a373eebc81aea1154be848e300237cd889177375bf19c
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to external PDF files, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

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://traffking.ru/123?utm_term=bobby+flay+grilled+potato+salad In PDF document text
    • https://cdn.sqhk.co/jabosuve/Ibexwhj/tulenele.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471250/normal_5fed610fd20b3.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/poIjbgg/jekazolaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_5fd80c90d297a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5f981864aac38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427273/normal_5feb2d978a8ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_5fba1f135b3f5.pdfIn PDF document text
    • https://mojurakikaluno.weebly.com/uploads/1/3/1/4/131438245/6378278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f873f3081803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465252/normal_5fdf1c3e435eb.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/2628003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f903be4687ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389352/normal_5fe556bcd46d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f903eec9a3a5.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/hidtib5/zadigibe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411229/normal_5fdd5f1b2acf8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 5500 bytes
SHA-256: 55773025b106eee8b2749d0df2d25e3dbb7d509786383e7bbcd1630b36ee3af3
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 10212 bytes
SHA-256: 1e25e3e95ee15eebd49002fe4b812d4f69a648b8ae9f507a824bdab1b88b398c

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