Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50be44302568783…

MALICIOUS

PDF

79.5 KB Created: 2021-02-23 08:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 008ca05ab70d39707a377c0c67f29c7e SHA-1: 6f2da4f89a94c4609d60e911314ed2328572653e SHA-256: e50be4430256878322d1dcde294355cd9c95c49e1925def29635e8914d6b4492
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or distribution mechanism. The document body, though heavily obfuscated, appears to be a lure related to a 'Parrot ck3100 user manual', which is a common tactic for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the embedding and redirection to external resources.

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
  • 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://jacksth.ru/aws?utm_term=parrot+ck3100+user+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5ff0a70db1a65.pdfIn PDF document text
    • https://xilamebi.weebly.com/uploads/1/3/4/5/134598653/luvozasifavuluxibo.pdfIn PDF document text
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/8bd2a10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408721/normal_5fdd9c9616c9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5fd77ce936bee.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/mapigibo-sikemo-limuwir-vusisivisubusat.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/palikuvexake/40652879021.pdfIn PDF document text
    • http://josuzilepetuwa.rf.gd/vagujopabaletigikap.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/edit_documents_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/73748532150.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/xexeperiwufepopaveti.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/taj_falaknuma_palace_guided_tour.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/stacked_bar_chart_worksheet.pdfIn PDF document text
    • http://sozejegisiwex.epizy.com/campbell_hausfeld_6_gallon_air_compressor_manual.pdfIn PDF document text
    • http://sogulonogob.epizy.com/clear_wifi_cache_android_phone.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_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 5368 bytes
SHA-256: 7b1bf43d78c98bc318ac9cba66c33745cc8a1bb4d8126dda6f0d84b1783d1453
font_01_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 10784 bytes
SHA-256: 11ebf21d85ac16c718bc093a52fa6655f8d43c8a73994ea419e83cbad873861a

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