Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc991fc5b9cbed5…

MALICIOUS

PDF

71.3 KB Created: 2021-03-07 07:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0ca0484db8c2946eca212b1aa9f9a2ed SHA-1: d26da97fa759d765716a5d8f6cd38f20d199aa19 SHA-256: acc991fc5b9cbed58dbad81c7d7c12d5982e50ca1d01f1e69be77aad58aaaba9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fokemale.ru/strik?utm_term=toro+timecutter+ss5000+mulching+kit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453730/normal_601d7b5e1f9b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_6019c468ac809.pdfIn PDF document text
    • https://cdn.sqhk.co/lolatonuvesa/beiipii/my_tashicell_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_602c789f7cd2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447093/normal_603fa47f60a23.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/jephijd/pawn_shop_mexico_city.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5fcd749c59dd1.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/jehcheE/fudumufitozavu.pdfIn PDF document text
    • http://watomidipokaki.22web.org/vateputenaperaze.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/ogcieid/24151287116.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/sazomo/vofebaruz.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_9b1f11d8fb6943a182c7d6c2874a2cbb.pdf?index=trueIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_dbd71b961f0446af8c8ad9c41f3dbdbc.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_fa70d33ef13c4ba391be50d2a0674a74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/joluwiriforitolomodes.pdfIn PDF document text
    • http://konugatevokaxot.epizy.com/99277163869.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/audit_report_submission_last_date_malaysia.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_5072c882eb6f49e4bbbc6ea4280348f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedudo/49544276775.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_2396093067a0493682b15bc4588aa5e9.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_43066e4e8fa34e5e959f0646181e5776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somamere/mosoxesezazazawokidaxefuk.pdfIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_ad5a339ef93746dbaef73c619b502a38.pdf?index=trueIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_810eeac19f354ea191297bdf6e923975.pdf?index=trueIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_45e48790f20b4d61ad83ab82844b6247.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_7b8c364d4e774d789606e9efbf30a9c0.pdf?index=trueIn 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_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 5284 bytes
SHA-256: 86e1b2c1c242d6b2db5c6dcc85ffc1255c3517423146080d53c6c4189dfb17a9
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 10152 bytes
SHA-256: 0c12b8862d36e1f048af49a134d553a9b200975acd50330779fb2a1a7c50896f