Malicious PDF — malware analysis report

Static analysis result for SHA-256 13926bf3a16646ec…

MALICIOUS

PDF

70.7 KB Created: 2021-02-26 14:35:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 4a5e56d8a602e912c8b4271e26d96eb6 SHA-1: 05445ffafc77b3b97d3140af842f7ea233333be0 SHA-256: 13926bf3a16646ecb5aa97ea2aab400400a1b081c4039de801a87faaef6ee27b
196 Risk Score

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://xajibur.ru/award?keyword=how+to+return+letters+to+sender PDF link annotation
    • http://zinuxuf.22web.org/blood_castle_mu_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_6033250693409.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/rafukijezujila.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375705/normal_6003a29b72857.pdfIn PDF document text
    • https://nubiduxabegi.weebly.com/uploads/1/3/1/8/131871606/wulubiritunebajiroru.pdfIn PDF document text
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/mifexifu_satufavesi_jimagimuko_rulaviruvusukav.pdfIn PDF document text
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/jomibunazed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393188/normal_5fffd21762a2e.pdfIn PDF document text
    • https://ranixujofenak.weebly.com/uploads/1/3/4/0/134016935/dinupovopuneniza.pdfIn PDF document text
    • https://tuduzijusesuzi.weebly.com/uploads/1/3/1/4/131406801/1004991.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/teximikamukubo/napozorezozimow.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/60535309967.pdfIn PDF document text
    • http://piwazazizalo.epizy.com/28969565362.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/kobupan.pdfIn PDF document text
    • http://xutakubu.epizy.com/dogifapagadoponikewagokod.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/18487008863.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/68070633090.pdfIn PDF document text
    • http://teguwawax.rf.gd/60069755589.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/sinusoidal_functions_as_mathematical_models_answers.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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 4660 bytes
SHA-256: 5c9d9d891efc3823509a3f06584d82d8a5fb945721de16a3e54cefe89efbd339
font_01_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 10364 bytes
SHA-256: 940b84a717ea84c88f5e756164b1701cc4bf45188c73371a7d945057fe5e3183

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