Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b75e15091b79ed4…

MALICIOUS

PDF

75.4 KB Created: 2021-02-21 20:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0e65ab3c4bde2d44dccc03a761aa3b73 SHA-1: 1ccfca77402ef08eda215050a6e096e571787749 SHA-256: 4b75e15091b79ed44c9559c547fc33b75a37bb377aacf6d585f38ae08bf35cdf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/strik?utm_term=how+long+to+hot+tub+filters+last PDF link annotation
    • http://ketosimple.online/27789838554q9liz.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/7261373.pdfIn PDF document text
    • https://gogesixemaso.weebly.com/uploads/1/3/2/3/132302802/zakoxema-maberi-pilat-lonuxuvizixo.pdfIn PDF document text
    • http://barberking.best/2982186347mmecy.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/semas.pdfIn PDF document text
    • http://interbank.link/worksheetworks_diamond_math_problems_answer_keyblxj4.pdfIn PDF document text
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/tadixerufov.pdfIn PDF document text
    • https://jukosixosibi.weebly.com/uploads/1/3/1/8/131871462/didebopiwoxikod-melajujo.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/ketigak.pdfIn PDF document text
    • http://shopyou.online/mass_effect_andromeda_annihilationzx5l0.pdfIn PDF document text
    • http://dvertsoff.ru/jegexuzofakurfiq95.pdfIn PDF document text
    • http://bapipakaroxi.22web.org/rovorezajatoxeri.pdfIn PDF document text
    • https://morisefomu.weebly.com/uploads/1/3/0/9/130969566/xemalujijizalip.pdfIn PDF document text
    • http://honey-love.ru/6210263279yx9vh.pdfIn PDF document text
    • http://slimitalia.space/hot_melt_adhesives_market_reportvuqs2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favigagiwu.epizy.com/vodixutulufoxalusasezup.pdfIn PDF document text
    • http://duposul.epizy.com/90927622316.pdfIn PDF document text
    • http://gisipusizen.rf.gd/free_fourth_grade_math_word_problem_worksheets.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 5220 bytes
SHA-256: 6e650c78ddfcc3b9f50f7517f1c38e0d663f890d5148d891057607d007940bb3
font_01_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 10932 bytes
SHA-256: 92dd51b4ec439425809da821629b085c45ad062627e9730ff64e4d864f9284d3

Open this report in the interactive analyzer, or submit your own file for analysis.