Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b3f541d988cec3…

MALICIOUS

PDF

78.1 KB Created: 2021-04-15 20:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d72499512cb417846f75e4d1209fa25 SHA-1: b68bc59a7d6694881c7af58a4d61d48b6d92ddb8 SHA-256: f1b3f541d988cec382f54628976151ede8f82b5698fb454685743e4163ed032d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The primary external URI points to a suspicious domain, 'jumiwimov.ru', which is likely part of a malicious campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/strik?utm_term=how+much+does+it+cost+to+make+a+rock+climbing+wall
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/944b6e4c.pdf
    • https://cdn-cms.f-static.net/uploads/4428035/normal_6021f5f6d4446.pdf
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/1049847.pdf
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/fexidotusaboxesit.pdf
    • https://cdn-cms.f-static.net/uploads/4472766/normal_60163c2244d69.pdf
    • https://cdn-cms.f-static.net/uploads/4453889/normal_602ed4cc0962c.pdf
    • https://gazikurow.weebly.com/uploads/1/3/1/4/131452893/vedakovowikaw-bimuzagumoxez-tuxinir.pdf
    • https://cdn-cms.f-static.net/uploads/4379489/normal_6047c68e75ab4.pdf
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/wivepi_ranikibowi_lelimid_zokamebegabuse.pdf
    • https://cdn-cms.f-static.net/uploads/4470412/normal_603ead1b8b1a4.pdf
    • https://cdn-cms.f-static.net/uploads/4501360/normal_6054918fdc8ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_240f732f801040d9a637b187f6a519a6.pdf?index=true
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_02c74c5572be4ebdac59661e9166120f.pdf?index=true
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_38e20cebbbcb4b66a1863fe7ae8533b2.pdf?index=true
    • https://0c6b2c5e-c852-454c-8c01-bea24f6181fd.filesusr.com/ugd/b97644_7145aafc988c4bf78a4d34b6db95c21f.pdf?index=true
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_c89f0d724d5c4df9bcab124d93c88f20.pdf?index=true
    • https://7211abc3-b26e-437e-abd8-8a8c7ebd4af5.filesusr.com/ugd/0683fb_f134506707834a5fb90ac008515ee5a8.pdf?index=true
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_f6d77ce36a69456bb4c57edbd7238556.pdf?index=true
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_1608c164767c4a18a4b3db3246b8c438.pdf?index=true
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_2cedb9abd8124c5293cf5f244b4f6825.pdf?index=true
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_d06220bdf13b4c6591a1c574e62d1dea.pdf?index=true
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_c5aefb4220a0430488a195f8be5f9792.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e2.bin
2d2baa331e590ba7f2d7c98c7e6a0e49e42e50526cd175dcaa67be0960e64811		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 5612 bytes
font_01_sfnt_off000105d7.bin
e90cd14d49c8164469a66afe466ecab81a1b45a96c7c2e759e612346508b6c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 10780 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.