Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5def3ba54737b8d…

MALICIOUS

PDF

67.4 KB Created: 2021-03-20 18:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7aef8f056ad8b56c4556401a5003520f SHA-1: d0c8491bb129ab51e0640411909a05c0548c6d3a SHA-256: c5def3ba54737b8dbc622aba5c37231618b5783134bb4be11d6a89d8dbb9fd6d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It employs SEO link farming techniques, embedding numerous external links, including one to 'http://beststudent.fun/nojexemusezaxonakefunibd3n.pdf', likely to distribute further malware or phishing content. The document body, though heavily obfuscated, contains text related to movie downloads, suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=hara+hara+mahadevaki+full+movie+hd+1080p+download PDF link annotation
    • http://beststudent.fun/nojexemusezaxonakefunibd3n.pdfIn PDF document text
    • http://regse.website/godzilla_chicken_filaqyjwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_6018480dd8bfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449600/normal_5ff671b1ca50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_5fd16ff273b65.pdfIn PDF document text
    • http://rentline.pro/829467249588z41j.pdfIn PDF document text
    • http://b4shop.icu/35995203372aqft3.pdfIn PDF document text
    • http://cybety.xyz/baby_trend_pack_and_play_replacement_matozwj0.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/tawovojo/what_is_1000_as_a_decimal.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/gikesaluzeliwikamapoboge.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_7787910eb0ce4612bab056ce594716a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/neluvap.pdfIn PDF document text
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_d32631b41d0a485da5aa1f2cffe54672.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_30a3e37755164f1a83a4f2c5b5aaf751.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/fidapirenogomik.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_4e3681d0bb6646949ee0fa6185e8d1c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vazisi/54309435666.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/reniform_kidney_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/toxuzilok.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_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 5668 bytes
SHA-256: 6f4470445eaa4c29ca52120e459ea9e4c31c4a46dd8ad1daa2014f8632d50b89
font_01_sfnt_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 10452 bytes
SHA-256: 05c3a315fc3592bec33af6eee85e75a48bd226937c4f3e7c3ca52659f1909153

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