Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1710401a1fd38c…

MALICIOUS

PDF

80.0 KB Created: 2021-05-07 13:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 30b14890dfda4768e7a19fc1ec7ff0fc SHA-1: eab8a906a3a4c95469987db2a2395a1795d6cd25 SHA-256: ef1710401a1fd38c189983249b5773677bb51c16ec041f696550dfa90e03b702
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a link farm with 30 external PDF links, and the embedded URL heuristic confirms the presence of external links within the document body. The primary malicious activity appears to be directing users to a network of potentially malicious websites, as evidenced by the numerous unknown-reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/strik?utm_term=aquecedor+delonghi+safe+heat+manual PDF link annotation
    • http://legujepug.22web.org/astronomie_carte_du_ciel.pdfIn PDF document text
    • http://afracheat2.xyz/morojedozabuzuxawojukukotstgnj.pdfIn PDF document text
    • http://roxaresasupuke.iblogger.org/40704894283.pdfIn PDF document text
    • http://experiment.website/co_marketing_agreement_template9rc1g.pdfIn PDF document text
    • http://websporizlehd.com/pixel_zombie_frontier_mod_apk8q2vf.pdfIn PDF document text
    • http://richmaya.site/babli_badmaash_songjulkg.pdfIn PDF document text
    • http://govnosiakxws.online/nudogabc0ueg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/degagaziv/73165935597.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/epson_workforce_wf2530wf.pdfIn PDF document text
    • http://poramukuwulaji.epizy.com/the_bible_project_genesis.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/28168325090.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/10780700317.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/17211919088.pdfIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_9fbfc8ed91a945fc8d1159b4e0df67c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/calculus_volume_3_by_s_narayanan.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_47998b0cfa684ec1a1ba4bfed787ece7.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 5432 bytes
SHA-256: 55a84b9fe065c82df540972a1f93535f356e0e81e2edfb062ac0adea890eb2b9
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 13216 bytes
SHA-256: 0ac8dbeea3ca7bc20552f7dc94c9a1b1e291cdf41622fd3b05729e8e826ab5d8
font_02_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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