Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6bbb1a30078563…

MALICIOUS

PDF

83.1 KB Created: 2021-04-11 09:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 538bede5d2f047a8edce20195659df9e SHA-1: c4f9c90505970ed055e84c5bc28dee214e050cab SHA-256: 1e6bbb1a300785631587873fa30799990d6764fe6a18ef7f083026a6e79909c5
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 pointing to what appear to be SEO-optimized documents, suggesting a link farm or content manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=ernest+hemingway+cat+in+the+rain+theme PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460233/normal_604cf6eeb4127.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/8642143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365594/normal_6004b8b469b73.pdfIn PDF document text
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/julakiz.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/gjapiao/manualidades_con_cascaron_de_huevo_nios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489722/normal_5fde82dfe3eae.pdfIn PDF document text
    • http://copyrightproblem.com/kibixefekirujegifoloexnvq.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/lumubupafexokefepo.pdfIn PDF document text
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/201655.pdfIn PDF document text
    • http://organize.shop/numerical_methods_faires_burden_4th_editionm7afm.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/kowotalazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490250/normal_60315c6d7e53e.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/ii4mggB/21124418668.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/vebenok/lasudijopakipufisu.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/10232368540.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/platform_technology_biotech.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/how_to_draw_a_cat_step_by_step_no_video.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/ap_statistics_practice_exam_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/what_do_ginko_leaves_symbolize.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/55321180872.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_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 5332 bytes
SHA-256: 5689682930bc0cb8abae663e6debbefb090f1d0936f0d43916984ff32f124176
font_01_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 14152 bytes
SHA-256: a1711afcf4b3542967390c7cab26d2aaea3dff9d6d2feb5097eb59ba390cc8e8

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