Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea7c12d0b76f160…

MALICIOUS

PDF

71.9 KB Created: 2021-03-28 16:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a0f35a961eadf501a22539fbfb9e336 SHA-1: 9286219bdf05c57b3e10821e6e7db2e9e84de29e SHA-256: 4ea7c12d0b76f160bec434fb52ba81ff877bcd74aa5178340ab2b82a2b9c032c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to a study guide, which is a common tactic for phishing or malware distribution.

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-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://mezovuduw.ru/wix?keyword=focus+on+nursing+pharmacology+study+guide+pdf
    • http://biwumani.mywebcommunity.org/40618035925.pdf
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5fcdf2a688b0a.pdf
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/ac19043a.pdf
    • https://cdn.sqhk.co/ligilitojob/y8gAghw/80491582162.pdf
    • https://cdn.sqhk.co/wubukuxivupe/icIFhsr/shatta_wale_prophecy_mp4.pdf
    • https://cdn.sqhk.co/xuxiropuwomo/geg2jbK/kurikeduzegafotuxunofuri.pdf
    • https://cdn.sqhk.co/goronikel/Whhgeja/62831325579.pdf
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/zevij.pdf
    • http://tideparipawovu.mygamesonline.org/75818963535.pdf
    • https://cdn-cms.f-static.net/uploads/4448746/normal_603cc9703d8f1.pdf
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/kagoserogona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_42b99e09691c4b968400a4346eba7a00.pdf?index=true
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_ed5e8aa44ffd4f60904d3a53b43fdf63.pdf?index=true
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_0de8d27d130d44caabbdc6c740d8292b.pdf?index=true
    • http://duxepivol.myartsonline.com/dikubo.pdf
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_e62c9ef93a304b7fa711e094c33a5802.pdf?index=true
    • http://movasedumanepe.onlinewebshop.net/libro_bullying_acoso_escolar.pdf
    • http://bebojivim.myartsonline.com/gibob.pdf
    • https://s3.amazonaws.com/lijulijowivaze/buxovodofunugubujadaludex.pdf
    • https://s3.amazonaws.com/fotepopunaj/types_of_lpp_method.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_off0000d9cc.bin
ef04731dbbe576df34c9a1e9fa4453fb8182e8650546ee45eb823a02767f85ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 5628 bytes
font_01_sfnt_off0000ecd3.bin
92c45807e90afc9e3fc48511d993c552de149afa7c7f2c731a00bf137be64d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 10980 bytes

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