Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c9621f994bbfd0…

MALICIOUS

PDF

80.3 KB Created: 2021-02-16 19:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9beac4810113f2bece667582b8581f1d SHA-1: 009b6730b29db0d2a92b80466898f5b7351952a9 SHA-256: 86c9621f994bbfd07ddc58d6300fa1bfefcc5f4d63a3f4188da5c96900b7ca07
244 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm and a phishing trojan. The document contains a large number of embedded URLs, many pointing to disposable hosting services, and one URL is known to lead to malicious infrastructure. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=samsung+s5+active+mobile+review In PDF document text
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/lukiredubatuvisi.pdfIn PDF document text
    • https://kowumawadixowiv.weebly.com/uploads/1/3/4/8/134888970/numasadupokigix.pdfIn PDF document text
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/4a338b.pdfIn PDF document text
    • https://pasugewu.weebly.com/uploads/1/3/1/0/131071180/8861809.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/pavorutinizuvusaxi.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/debafusowus.pdfIn PDF document text
    • https://momewevegugeb.weebly.com/uploads/1/3/5/3/135326076/matizojak.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/9861527.pdfIn PDF document text
    • http://nesadurem.22web.org/17941968967.pdfIn PDF document text
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/vigabukem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujesotes.epizy.com/family_feud_board_game_walmart_canada.pdfIn PDF document text
    • http://genuziga.epizy.com/how_to_clean_an_edenpure_filter.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/jesuramebizawunilagom.pdfIn PDF document text
    • http://ziwejozaz.epizy.com/ada_county_current_arrests_report.pdfIn PDF document text
    • http://relumewamamit.rf.gd/dota_guidez_heroes_1.pdfIn PDF document text
    • http://totofexux.epizy.com/chronic_pancreatitis_treatment_guidelines.pdfIn PDF document text
    • http://nanesipub.rf.gd/66878815032.pdfIn PDF document text
    • http://malinaliwul.epizy.com/30640988121.pdfIn PDF document text
    • http://zilidezokap.epizy.com/situveletafipes.pdfIn PDF document text
    • http://tutunod.epizy.com/charles_chapman_pugh_real_mathematical_analysis.pdfIn PDF document text
    • http://borovob.epizy.com/crafting_ascended_gear_gw2_guide.pdfIn PDF document text
    • http://padekapekalerel.rf.gd/sabodilinuzojijenub.pdfIn PDF document text
    • http://lafeseg.rf.gd/17276800331.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_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 5636 bytes
SHA-256: cf293d350502a0be28e08e771c9bf5446e566c54f2017191635d3a8b18ce99e6
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 11124 bytes
SHA-256: 86a6f7d963082754ca51798bb58bb622d6659d44bffef09eef0522d4e1762fbe

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