Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2787e5abf4bba9…

MALICIOUS

PDF

85.7 KB Created: 2021-02-24 11:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b44b5b6d35fa5dd2a479348f126863e SHA-1: 7c4e1c8802e86deac31c5d965dfad98d41dd49b8 SHA-256: 4e2787e5abf4bba950933662180cf390065b122787e3ab7af5b6c8e3cfa86fbc
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 or unknown domains, suggesting a link farm or phishing attempt. The primary external URL, https://maypoin.ru/123, is presented as an answer key, likely a lure to direct users to a phishing or malware distribution site.

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://maypoin.ru/123?utm_term=scatter+plot+prediction+worksheet+answer+key
    • https://cdn-cms.f-static.net/uploads/4389793/normal_603327db4282d.pdf
    • https://cdn.sqhk.co/bikegola/hiBgeha/parent_plus_loan_interest_rate_2020-_21.pdf
    • https://cdn-cms.f-static.net/uploads/4494160/normal_60225d735f800.pdf
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/e330d73c0d703f.pdf
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5ff1f994c45db.pdf
    • http://puvememora.22web.org/dekuz.pdf
    • https://cdn-cms.f-static.net/uploads/4492575/normal_5fe803ab84c48.pdf
    • https://cdn.sqhk.co/duwokarewesu/YejhKif/mobizen_screen_recorder_mod_apk_download.pdf
    • http://situbune.iblogger.org/quality_assurance_technician_job_description_template.pdf
    • https://cdn-cms.f-static.net/uploads/4465025/normal_6020f8fb616e8.pdf
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/lixiranew_xipitukefap_fozuf.pdf
    • https://static.s123-cdn-static.com/uploads/4456660/normal_60006d4e6c2e0.pdf
    • https://static.s123-cdn-static.com/uploads/4493916/normal_5fde2094123c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dorulusof/bleach_vs_naruto_3._1_ios.pdf
    • https://s3.amazonaws.com/wujodibu/hampshire_police_report_lost_property.pdf
    • http://netupabajezi.rf.gd/gojedodebevutemotulizu.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_off00010ef1.bin
366f3a6925c9eac5e4ec1ce071a10e16e42d0a7394d001f17825e24c8084d744
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 5520 bytes
font_01_sfnt_off000121c5.bin
5f62e6ea054c70b1304b2df02db8c688a276bff6b4fca93411134ff684a68c49
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 11776 bytes