Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5139c31206b4857…

MALICIOUS

PDF

74.9 KB Created: 2021-04-03 00:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b1aab3874dfafa18bb25ba06cf49786 SHA-1: b1142c026fe026a7145e40e61a6a2af845b9e0f8 SHA-256: c5139c31206b4857ae958734b4b97ace98bc2cf8c0a34c6095d0231773633ac2
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous external links, many of which point to SEO redirectors and potentially malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The document body, though heavily obfuscated, contains keywords related to "two stage method" and "wkhtmltopdf", suggesting a lure to download further content or engage in a phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=what+is+two+stage+method PDF link annotation
    • http://distornyup.site/introduction_to_computer_programming_using_pythonr56kb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_6056c7a16e077.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/rudofudolo.pdfIn PDF document text
    • http://atelier-spb.com/psychology_quizlet_chapter_3cjv8x.pdfIn PDF document text
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/wasuvidopefos.pdfIn PDF document text
    • https://fagudigozupubu.weebly.com/uploads/1/3/6/0/136042622/xumavanofegitoruf.pdfIn PDF document text
    • http://lasinonid.iblogger.org/32465416960.pdfIn PDF document text
    • http://makamar.xyz/simple_grocery_list_app_freelnvy7.pdfIn PDF document text
    • http://navaram.online/ketiwutuzewutuzezuxu2x3ko.pdfIn PDF document text
    • https://xagapetudiza.weebly.com/uploads/1/3/4/6/134686513/fobipowupunosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_600a21f30fc72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_60240e7fa1dbe.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/diwitapezu/jagikipejemalutodigowa.pdfIn PDF document text
    • http://kabavobeligumod.epizy.com/lobimajuvukagiwozupesis.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/41523143885.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/semoje.pdfIn PDF document text
    • http://rusowemiwa.rf.gd/pegugopu.pdfIn PDF document text
    • http://lakovejaduga.rf.gd/adventist_church_manual_2020.pdfIn PDF document text
    • http://pababevo.epizy.com/ias_29_financial_reporting_in_hyperinflationary_economies.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/81253894314.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/98217040009.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 5216 bytes
SHA-256: e6e9d9914d0bc1421d5d2b282ee67f0cf3827b1097efcf109490c5ce473e9711
font_01_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 11964 bytes
SHA-256: 39ce9135b3ef3346bd7785cafe54cc9bcea65237d07bb8da188a69c3cc45fa99

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