Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87c60e69437e791…

MALICIOUS

PDF

82.0 KB Created: 2021-02-12 22:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10b8b3984fb7d6a1ff961b8275d8c01c SHA-1: 7473fe69d9efaef7f6cf94f47ab26cefa250c2cf SHA-256: f87c60e69437e791134bd601725982e80f5a196908f8132335a685c85f6ebb1c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and contains what appears to be metadata rather than user-readable content, suggesting the primary purpose is to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=mirchi+ka+salan+vismai In PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/8244792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_5fdc8104277e4.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/fjigdha/masterminds_book_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/37Mia3l/24708545122.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417327/normal_5ff7d23b3b892.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/5a9bb4f0d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404113/normal_5ff7b51e542ac.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/0e93aa27b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418367/normal_5fe191b1203c6.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/4058867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5fd07ff2f1e18.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/jidwhf3/xababo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393041/normal_5fcd5bb29ddd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_6015029654cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_5fd8554200e0b.pdfIn PDF document text
    • https://cdn.sqhk.co/nemalerute/gjbjagi/how_to_beat_dragon_god_demon_s_souls.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/tozedikumur.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/kojujelinuxinuzolupopome.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/fagemer.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 5168 bytes
SHA-256: bf34e0ddbb9a7d64074b6980dc273d5ddc001e76361fc7be0d58aab7e207e4f3
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 2328 bytes
SHA-256: 18b250f24057ce91e4a59b25c1eec79fa8b4d7e2cb9f6c0de02c7e032a072fd4
font_02_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 4384 bytes
SHA-256: 03374dc71a4248c8a3cd18c8bf1f7ad986cc7500d782376053f8438a4f4ef4d1
font_03_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 10780 bytes
SHA-256: 4afde475f92f24d63f825e2faba6a8c71c10942c1be73c2bd483de3974c8f113

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