Malicious PDF — malware analysis report

Static analysis result for SHA-256 513129e6bf86c75c…

MALICIOUS

PDF

116.7 KB Created: 2021-05-09 01:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5c69ead1d7312b844ee096a1e0fe3596 SHA-1: 86b4fcd17d1f43cd30f5b149e283b57518019f78 SHA-256: 513129e6bf86c75cbda186dd797ed9987ac6ae78e764eca5421233df908bc828
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to a book summary. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to sites like 'resalured.ru' or 'stepka2016.xyz'. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://resalured.ru/strik?utm_term=inteligencia+emocional+daniel+goleman+resumen+por+cap%25C3%25ADtulos+pdf PDF link annotation
    • http://stepka2016.xyz/parometufudmtg13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388626/normal_5fd89e2dc6060.pdfIn PDF document text
    • http://hayatevesigar.online/gdp_and_per_capita_income_of_indiarvnl0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_60393dab0a0fd.pdfIn PDF document text
    • http://amin-ukraine.net/zubopesivabulilxdva.pdfIn PDF document text
    • http://boevoenlp.com/358680769869yrcx.pdfIn PDF document text
    • http://politach.com/969002146623mg3r.pdfIn PDF document text
    • http://meetsol.xyz/2073242174608zmc.pdfIn PDF document text
    • http://hookup154.site/mirror_lake_utah_boat_rentalmmk4o.pdfIn PDF document text
    • http://hopecommunitynaz.com/haier_6000_btu_portable_air_conditioner_revieww299c.pdfIn PDF document text
    • http://potolkilife.ru/tivaluluradavulewovxp08.pdfIn PDF document text
    • http://gmetry.online/7148341992503fa3.pdfIn PDF document text
    • http://whitetwo.space/komalodasugohkrmf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_601d2f51ef26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fdc547990b64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb09fb3b-8379-43d8-a081-033524593df1/soleus_air_95_pint_dehumidifier_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e545cd-d1bf-4081-9516-d9ffaa081663/fesudiverumufulubuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b5715c-d11f-402c-a6c4-dfabe2a79232/dewalt_dw744_motor_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89f020e-7329-437f-bdae-5ffd3aa350bf/can_you_take_the_sat_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d855fba-0568-4ea3-9c59-ba120d6953ce/11352308242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e752825-1ce2-49f4-9630-044805a0b883/fidepene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e21f469-66c2-4879-8fae-3c224f815500/vudogirebogudeze.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_off000187ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187AB 5464 bytes
SHA-256: a617773cfbd9536bcf0ebeb5e7780a6b0a0e27815462c37ffd4bda8ddc747fa1
font_01_sfnt_off00019a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A35 12496 bytes
SHA-256: 43fa147a08b9f3f94a218cb89a6ae35c173463869a72be2f919d4264a9b7d583

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