Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b8c7541f61ad1a…

MALICIOUS

PDF

79.5 KB Created: 2021-04-20 17:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cdec66b6365cc6d40f8a5f61140c7b28 SHA-1: 10c13a88a4c5b950fbef6208320b8ce12828d4c3 SHA-256: b3b8c7541f61ad1a272794bd99d8b74e8fa1d073521f4ca4f7d313180be4c585
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9991

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
  • 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.
  • 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://botokaw.ru/strik?utm_term=sylvia+day+georgian+series+order PDF link annotation
    • http://dhl-order.info/how_to_know_my_adobe_serial_numberrgg77.pdfIn PDF document text
    • https://cdn.sqhk.co/jujegopenop/5Bm25gL/4695931016.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/gnu8wgd/683318909.pdfIn PDF document text
    • https://cdn.sqhk.co/mivoteloxip/56gjEYk/17351814915.pdfIn PDF document text
    • http://the-job.ru/rules_of_the_internet_list4weyj.pdfIn PDF document text
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/kewedagoseve-jurafavoxoz.pdfIn PDF document text
    • https://cdn.sqhk.co/bezizafosu/kQ5ZUje/46715886624.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/bosukoxebosos.pdfIn PDF document text
    • http://iglivesupportteam.com/18160706176h9bgy.pdfIn PDF document text
    • https://sudejewakigalo.weebly.com/uploads/1/3/4/0/134040490/6299841.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/dOieRij/tenokusudagevawef.pdfIn PDF document text
    • https://jabesukugadipo.weebly.com/uploads/1/3/2/8/132814964/942639.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/wVTjhhc/btwin_500_wireless_cyclometer_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/tibthjM/nugexufidusizorukasa.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/cDejcrA/recarga_rapido_luxo.pdfIn PDF document text
    • http://ipatovaalena.ru/analyzing_graphs_of_polynomial_functions_worksheetbe5q8.pdfIn PDF document text
    • http://saleproducts.pro/40696369249yqzq1.pdfIn PDF document text
    • https://lejuziluzamof.weebly.com/uploads/1/3/4/8/134863123/dimapafikopiwegeno.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/OjghbFR/56628934826.pdfIn PDF document text
    • http://sushibara.net/balloon_tamil_film_songs_freeppwj3.pdfIn PDF document text
    • https://cdn.sqhk.co/zivupowixede/Khihbha/robumal.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/cG0bgja/zotigare.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/EzjhTnH/jitakedusog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 4964 bytes
SHA-256: 6b72c1cbbdd0e80e80478f9865246a76012bd68381d4b896a0b27eb09a0defaa
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 11048 bytes
SHA-256: 28d4d8eb68484e918c0a7ed3a183a1c6d1098c7e5025fe39e975f91b1112e2d3
font_02_sfnt_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2