Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35eee52c6adf5d5…

MALICIOUS

PDF

73.2 KB Created: 2021-03-03 10:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 972a287d27d5b30e089256139762f663 SHA-1: 217a9dccaa9105d56dc8b099f1a8fa5a790fe759 SHA-256: c35eee52c6adf5d50aca39cc3cfa9444322eeaccf9f86931e7c674bfd01ff0e3
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though partially corrupted, suggests a lure related to a school calendar, which is a common tactic for phishing. The presence of multiple external URIs, including one on disposable hosting, indicates an attempt to redirect the user to malicious sites for further exploitation.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/123?utm_term=hillsborough+county+high+school+calendar+2019 PDF link annotation
    • http://lidlid.xyz/wumixarirebezedr.pdfIn PDF document text
    • https://wavimukuwu.weebly.com/uploads/1/3/0/8/130874629/860492.pdfIn PDF document text
    • http://leree4.club/bootstrap_responsive_login_page_templatelrwnr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_600469122b208.pdfIn PDF document text
    • http://gawewatejunowib.iblogger.org/m_butterfly_full_play.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_6038d536cb22c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5fec92e360b0e.pdfIn PDF document text
    • http://abistrans.ru/680299934204sx96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_601e5a44090c5.pdfIn PDF document text
    • https://tefeteti.weebly.com/uploads/1/3/0/9/130969297/8187635.pdfIn PDF document text
    • http://remontnatali.ru/ginitewib71cid.pdfIn PDF document text
    • http://file-id.ru/what_oil_for_honda_eu2200ir7odf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/savifin/tanorawobilepumud.pdfIn PDF document text
    • http://sidiwen.epizy.com/wefisuzasafet.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/65602418457.pdfIn PDF document text
    • http://bopenakonaj.rf.gd/cosmoline_sds_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/20979885692.pdfIn PDF document text
    • http://rujidita.rf.gd/56842425633.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 5888 bytes
SHA-256: 32d25adc380a2481d335860767d25447ec038c8ac67ad486953ab363d5e614f1
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 10896 bytes
SHA-256: b7078225234969f33dd15d072e99d204267394e62f8b2f4328ae835245be8212

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