Malicious PDF — malware analysis report

Static analysis result for SHA-256 5795706bc2672095…

MALICIOUS

PDF

77.7 KB Created: 2021-06-15 09:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10d51327806ac7126a26323a72047198 SHA-1: 4231e94ccbef70fb7e55c2b41288af79e60e3ad8 SHA-256: 5795706bc2672095daccfb61565d1c1e7632c2a0a236385a4d45c333ce732777
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 pointing to PDF files hosted on link farm sites like Weebly and PBworks, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tuzenuzibawura.weebly.com/uploads/1/3/4/7/134733138/684e65a.pdf
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/xetonajovozutiwim.pdf
    • https://cdn-cms.f-static.net/uploads/4443574/normal_60c4f06897f72.pdf
    • https://cdn-cms.f-static.net/uploads/4451363/normal_606dea63c5820.pdf
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/8791dff7df4.pdf
    • https://nivenenururela.weebly.com/uploads/1/3/4/5/134585639/81455781.pdf
    • https://zibabesisem.weebly.com/uploads/1/3/4/6/134670176/6185974.pdf
    • https://betozuwozoz.weebly.com/uploads/1/3/4/1/134108580/govedefagawa.pdf
    • https://depujoseteg.weebly.com/uploads/1/3/5/3/135309287/6766897.pdf
    • https://gedowejokose.weebly.com/uploads/1/3/4/0/134040639/gunajovimuligeta.pdf
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/7150333.pdf
    • https://dujeranisijoku.weebly.com/uploads/1/3/0/7/130776063/vuwibuxe.pdf
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/sasume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=cyberpunk%202077%20ps4%20pro%20gameplay%20reddit
    • http://zetewufor.pbworks.com/f/zubedirejamanutiduziwodi.pdf
    • http://katafuzum.pbworks.com/f/zevenuxoxarebijexawod.pdf
    • http://jowukon.pbworks.com/w/file/fetch/144648207/fimon.pdf
    • http://tagiruxot.pbworks.com/w/file/fetch/144658743/39465262503.pdf
    • http://vafobotigef.pbworks.com/f/81012537318.pdf
    • http://najapenoz.pbworks.com/f/kaboledeganegunokoze.pdf
    • http://vevokofeju.pbworks.com/f/90193941016.pdf
    • http://zujawafam.pbworks.com/f/24982237239.pdf
    • 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_off0000efa7.bin
0f5ef28f31844f475706ac3bc534b2c00a9f621964be942d2139f24ca69524ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 5932 bytes
font_01_sfnt_off000103d1.bin
48e216a5565c533a9a99fdc657cd0b3093dad841044b8550f37e0bb1e7c10116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 11076 bytes

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