Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d7443f10c394e5…

MALICIOUS

PDF

110.0 KB Created: 2021-04-02 00:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 324039db8a0a62617ade9093449686bc SHA-1: 7e58e3a86638b86a482072933829b886d55a60a9 SHA-256: 13d7443f10c394e50bc9d1e114d8aba60f821d9ffbaffdc2e048e9914929f539
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on S3 buckets and appear to be part of a link farm designed to manipulate search engine results. One critical heuristic identified a "PDF_SEO_LINK_FARM" with 30 external PDF links. ClamAV and an ML classifier also flagged the sample as malicious, specifically as a "Pdf.Phishing.Trojan". The embedded URLs suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://zajinet.ru/strik?utm_term=delorme+inreach+explorer+maps PDF link annotation
    • http://dupuladusudired.mypressonline.com/cheats_gta_5_pc.pdfIn PDF document text
    • http://zokumujanuni.iblogger.org/arsenic_pollution_in_drinking_water_in_west_bengal.pdfIn PDF document text
    • http://zumodaronomana.iblogger.org/chiang_rai_tourist_guide.pdfIn PDF document text
    • http://walabowagem.iblogger.org/fasedisikexomasiwij.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/chomsky_anarchism.pdfIn PDF document text
    • http://xokapik.mywebcommunity.org/742663327.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/divelatoxa/43086689566.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/canaletas_para_cableado_estructurado.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/93316968865.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/zegolizifezaxapesigenub.pdfIn PDF document text
    • http://domozutelopo.rf.gd/equivalent_algebraic_expressions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/xoruxeburatomixo.pdfIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_a645b0e102984407bb6aed7aa2a1f0ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/printable_bump_key_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/89964317974.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/formal_letter_addressed_to_a_company.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_d289ba0050094ddd93e53a3fbd3ce8a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sejakopa/faces_edges_and_vertices_of_solids_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/mavure.pdfIn PDF document text
    • http://luvojidepezepag.epizy.com/kodobipekezofowuvap.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/sokekexeva.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/90697314289.pdfIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_b970f750b5b24025a43cd08769362729.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_off000171c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C5 5240 bytes
SHA-256: 959af11c269dfab716e1a0671324398303dd852b3e64bc57e433d33e1cd2c015
font_01_sfnt_off0001836f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1836F 11288 bytes
SHA-256: fa987246a022c3447dfbc24e04404259e7531aa8fec5d29f6f271536c12b9320

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