Malicious PDF — malware analysis report

Static analysis result for SHA-256 adebae76e8a962cc…

MALICIOUS

PDF

70.9 KB Created: 2021-02-23 21:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 4f5b79500b90ab0dc2d5c0bf6761dfbd SHA-1: 0a23275fbc99b559dd63a7d66e37ad12ebe08fec SHA-256: adebae76e8a962cc9f91975e05aa777322fdc47bb6675403baafdc3846762795
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a large number of external links, many of which point to other PDF files. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, with one prominent URL being https://s3.amazonaws.com/bupaxomu/xanax.pdf. The presence of JavaScript and the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://seumenha.ru/wix?keyword=boondocks+episode+11 PDF link annotation
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/995244.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/guzedaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_60097b2a44814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_601736d7271c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5fd288f8a3b63.pdfIn PDF document text
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/06882.pdfIn PDF document text
    • https://vovavurag.weebly.com/uploads/1/3/0/7/130739927/giridanumowin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5fff436787739.pdfIn PDF document text
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/8752536.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/bupaxomu/xanax.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/chaudire_gaz_haute_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/fimurovu.pdfIn PDF document text
    • http://patenat.epizy.com/sulibevu.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/bijufuzuzagugij.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/concrete_and_abstract_noun_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/xibekanururitegivagi.pdfIn PDF document text
    • http://ruzuvune.epizy.com/9512812181.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/47575455752.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/folifitera.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/44844409793.pdfIn PDF document text
    • http://vutuzirowu.rf.gd/54517734231.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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 4896 bytes
SHA-256: d8d8324d754a6ba99c0d7e8b8da7006a8204db533508e17b2cfcf1061ca65e6b
font_01_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 10288 bytes
SHA-256: 7e38cbc963c9c1c27308b14acfdcae009ac6498c0fcf7d53fcac5999c6dacb7b

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