Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e4fb9af83f3fc2…

MALICIOUS

PDF

74.3 KB Created: 2021-02-22 05:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d22489be2e8feeaa1e2b06b334ac8e94 SHA-1: 6b53f3f7877c413d7d3be1f14f200c70c2216266 SHA-256: 55e4fb9af83f3fc253eccde4c5ab7345745f32aa18910f6573861082e809fc5d
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to link farms and redirectors, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ClamAV detection and ML classifier further support its malicious nature. The primary goal appears to be directing users to potentially harmful external sites, possibly for phishing or malware distribution.

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
  • 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.
  • 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/aws?utm_term=casio+lk+100+keyboard+review In PDF document text
    • https://nujujuzizupefe.weebly.com/uploads/1/3/1/6/131606206/zopukilosiz.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/tagedadesifugogozev.pdfIn PDF document text
    • http://makamar.xyz/city_car_driving_simulator_2_mod_apkdsq6g.pdfIn PDF document text
    • http://rafonuza.22web.org/anecdotal_records_information.pdfIn PDF document text
    • http://goodnaturak.space/fewipetaluwovapulopexubjteyf.pdfIn PDF document text
    • http://nonly.xyz/marisuwobetozejuterugewarc3cnd.pdfIn PDF document text
    • http://krokoboko6.xyz/hematologia_ruiz_arguellescneuh.pdfIn PDF document text
    • https://bixugukov.weebly.com/uploads/1/3/2/6/132680808/e7420a.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
    • https://s3.amazonaws.com/suximawo/zolovuxuzokewazegux.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/83355597352.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/appendices_in_a_report_apa.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/abscesso_dentario_antibiotico.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/vijanupin.pdfIn PDF document text
    • http://wekapalipewux.epizy.com/imperatives_worksheets_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/kofolabiluguboluwukafaruf.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/betipelabi.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/cbre_annual_report_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 5096 bytes
SHA-256: 2cee679ff3b4fee65c32b5024f68accf4ca8498fb853d95c24414ea6547e8c72
font_01_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 10576 bytes
SHA-256: 08b0a392c7153c802b343b074befe445bac6f4200d8b664570e82d379122bfd3
font_02_sfnt_off00010e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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