Malicious PDF — malware analysis report

Static analysis result for SHA-256 2175045bdc14bb8c…

MALICIOUS

PDF

71.9 KB Created: 2021-05-31 13:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 054d3c3cf90e051d2799d26a266c9384 SHA-1: 09d255edde7adf980895f00d37603a20ef50d81c SHA-256: 2175045bdc14bb8c5facd718e262a46796baa982f476bf78fa1d29a477589566
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable hosting, with one specifically identified as a malicious redirector. The document's content, though heavily obfuscated, appears to be a lure for users interested in games. The presence of multiple links and the redirector suggest an intent to lead users to malicious sites for phishing or malware delivery.

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 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://yafferge.ru/strik?utm_term=how+to+play+giant+pass+the+pigs In PDF document text
    • https://dizubegunusu.weebly.com/uploads/1/3/4/8/134889053/1815565.pdfIn PDF document text
    • https://wuwenesugujiku.weebly.com/uploads/1/3/0/7/130739695/dixak.pdfIn PDF document text
    • https://vigojipawus.weebly.com/uploads/1/3/2/6/132695212/b39921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_603a1df4340ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_6029caa2d2d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5fd9c88e0ac75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391599/normal_5ffb6949a89e6.pdfIn PDF document text
    • https://xaxusirawo.weebly.com/uploads/1/3/4/3/134318026/4785155.pdfIn PDF document text
    • https://xaxovalalek.weebly.com/uploads/1/3/4/0/134040353/nitivajuworaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_600fce4e6a03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_6018b1047cf30.pdfIn PDF document text
    • https://kuvakikarubefi.weebly.com/uploads/1/3/1/3/131383404/gulora.pdfIn PDF document text
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/9e0b7c5d82740.pdfIn PDF document text
    • https://bofuvozera.weebly.com/uploads/1/3/5/3/135331850/rinegame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375690/normal_5feccceedaa11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_60446fa6a9ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_60190866f30e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415530/normal_5fe2c63a84058.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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 5140 bytes
SHA-256: 27ac53cdd14cf14cbe74c27a46dec73fc97a17056ed53f784993e3acfd81d8ec
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 11048 bytes
SHA-256: 8d0d475320a0d440fb2f8c446f469100c77b88dfa6633b815a43f0cb64009812

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