Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4fc3fb585bfebd…

MALICIOUS

PDF

80.2 KB Created: 2021-02-21 04:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 208e49c27932d6347d0c87b25556ce0c SHA-1: ee1612cb9d6268b29ebcf381c9de179f65d00346 SHA-256: dc4fc3fb585bfebda1111cc2161f9ce32e607f5498b8784b02b9b3e6d02e8599
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured to mimic search result links, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the malicious intent. Although no scripts were explicitly extracted, the presence of many external URIs and the ML classifier's high confidence score point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=introduction+to+mineralogy+william+nesse+pdf+free+download PDF link annotation
    • http://dkmz2.club/26732016415gxtop.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/pte_academic_vocabulary_listai5i1.pdfIn PDF document text
    • http://bellissimo.online/vivukoziwasuguratc9445.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/b2780a0fa.pdfIn PDF document text
    • http://stylecurtains.com/apostila_de_matematica_para_vestibulari22l0.pdfIn PDF document text
    • http://mandarin-fruit.space/power_outage_report_duke_energyrmxtm.pdfIn PDF document text
    • http://boomua.site/lugukugadodazuwulotokaj8fr5x.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/a4dd03dc.pdfIn PDF document text
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/2896582.pdfIn PDF document text
    • http://trenolgia.buzz/kaxibixupanejopizocq72r.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/faruduzugu.pdfIn PDF document text
    • http://douchelabs.xyz/avabel_lupinus_build_guidemyxq3.pdfIn PDF document text
    • http://216tilford.com/siwinazexiwuvul7h16.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/sakaburepagase/detizugabififosowosiv.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/perforated_paper_half_sheet.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 5608 bytes
SHA-256: b349bd14c50cf8ba5d0f792060c67193f2bdaeb45110abab36d9729447f0f959
font_02_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 10948 bytes
SHA-256: 7c2699072d55825e5a8ba6cffb810015655cbb6da7e4a635f2dc604e6bb64381

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