Malicious PDF — malware analysis report

Static analysis result for SHA-256 829f3e7c50a5c90b…

MALICIOUS

PDF

78.0 KB Created: 2021-02-20 21:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e20f5df85f19f9fa564d739fe0e62d57 SHA-1: 4ed6c865975ebe1667eb87fa8c382ba95303c139 SHA-256: 829f3e7c50a5c90b278e1cf745bbefe8608b2ba516c0b433e05e6eb994313c1d
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous embedded URLs points to an attempt to redirect users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=ron+paulk+workbench+height In PDF document text
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5fdd778231fb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495262/normal_5fc965ff9f4ee.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/2970151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5ff88ffbe29eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_601ad8c52c261.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/hgifjfC/ice_cube_crushed_ice_meme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_602ab32ee2b1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499660/normal_5ff23cfd2c096.pdfIn PDF document text
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/gobusixirurif.pdfIn PDF document text
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/gagitokuredi.pdfIn PDF document text
    • https://wapofaxuza.weebly.com/uploads/1/3/5/9/135992917/voxozadewizowut.pdfIn PDF document text
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/varoxoxebet.pdfIn PDF document text
    • https://kunasituper.weebly.com/uploads/1/3/4/7/134765547/guwefebesiledovasa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375071/normal_5fe283d2ea822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390664/normal_5fdcbe73c6294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wetavirevamo.epizy.com/71156055193.pdfIn PDF document text
    • http://nobixemoxuf.rf.gd/tugamogig.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_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 5320 bytes
SHA-256: 3a17c2cc1f7765fa528fee9a1412175f687706a7f0c3a5d285f0c327130689ed
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 10784 bytes
SHA-256: 7cfa71f0d8cad2a1588909227a85538dcf2964a84e28ca53017fdf65ff1b02a7

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