Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc8089feb847bb0…

MALICIOUS

PDF

74.1 KB Created: 2021-04-06 04:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a22c27b37fe41838f9a6b834eb341a72 SHA-1: 91fcc39342c735d4e4096704199306ce60e063c2 SHA-256: afc8089feb847bb057ad27ab8f7edd7c45161b45c15977113ffe7a1a35b56916
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 disguised as document titles, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/aws?utm_term=convert+html+file+to+ipynb+online
    • http://dipugipedanam.sportsontheweb.net/classification_of_animal_kingdom_class_9.pdf
    • http://jesofoma.getenjoyment.net/samsung_galaxy_tab_4_sm-t230nu_price.pdf
    • http://piguredadesab.iblogger.org/49526721223.pdf
    • https://pipomojum.weebly.com/uploads/1/3/4/4/134437532/5119c.pdf
    • https://nokejulaju.weebly.com/uploads/1/3/4/6/134696540/4733617.pdf
    • https://kowumawadixowiv.weebly.com/uploads/1/3/4/8/134888970/luxivomefina-kefetisoguj.pdf
    • https://jazasamiwuri.weebly.com/uploads/1/3/4/8/134889091/19d7a54b5944fb.pdf
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/8121534.pdf
    • https://ruminugovukaka.weebly.com/uploads/1/3/0/7/130740017/dd7165975e5.pdf
    • http://jovopomutulilo.medianewsonline.com/56528426732.pdf
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/winula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_9bdf8e79e7e440ac810c8c9996b02a29.pdf?index=true
    • https://d85b1738-a471-4043-b59e-116b2bb794a3.filesusr.com/ugd/97927e_87a8c5bfdfcf4387815d9f167f66979f.pdf?index=true
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_348486c7d5414208a4ba60902599798f.pdf?index=true
    • http://jufosuliz.epizy.com/22769640284.pdf
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_7e1d906a22ee451eaf2395f90c462f0a.pdf?index=true
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_e7091adb9e2b467c8c9d8ebdac397941.pdf?index=true
    • http://vimonaker.epizy.com/field_view_care_home_cqc_report.pdf
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_fd7f9368cb4b4f70b6d484f5caf58a28.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_off0000e6d0.bin
0a1fc93ee2e0e4082e5f277a485892fc462a4d576dd6e34a1a7762a2114750f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 4960 bytes
font_01_sfnt_off0000f790.bin
77545f92532b225b1e28beaf82651f2aa9a61411055309a1f04e03a206802a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 10320 bytes

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