Malicious PDF — malware analysis report

Static analysis result for SHA-256 136167ac2a2eb30e…

MALICIOUS

PDF

71.1 KB Created: 2021-02-25 13:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 840bd08b8b36dbb5b94aeb64145a90e0 SHA-1: 9981f6423432dc19a498f4d9204fbd5d7cb60178 SHA-256: 136167ac2a2eb30e0c002d0ba3253994dbb5d0b738f0d6132ee4bf03e31404cf
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://leonvi.ru/award?keyword=what+is+the+purpose+of+an+estoppel PDF link annotation
    • https://fevujuwevu.weebly.com/uploads/1/3/0/8/130813851/5181886.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/numafaweleputulog.pdfIn PDF document text
    • https://xuvasilibozin.weebly.com/uploads/1/3/5/3/135335949/wenovoketitan.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/79698609493.pdfIn PDF document text
    • http://felixojo.22web.org/dbpower_ip_camera_android_app.pdfIn PDF document text
    • http://itdiscount.info/ridinogiperugigivisukmygy9.pdfIn PDF document text
    • http://pusedoropeseb.66ghz.com/76424602315.pdfIn PDF document text
    • http://sesapoleva.22web.org/paths_to_recovery_step_12_questions.pdfIn PDF document text
    • http://useplafond.xyz/96393485989b3j2q.pdfIn PDF document text
    • https://nulasexojexof.weebly.com/uploads/1/3/4/0/134012614/tisofikumu.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/safenalavojuwu/anarkali_old_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/film_storyboard_template_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/34031742234.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/white_christmas_tree_sale_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/android_1_mod_apk_hungry_shark_world.pdfIn PDF document text
    • http://sufuturafo.epizy.com/how_to_pair_samsung_aa59_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/kuwoxuviwowejofonisatu.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/vakixofukofabin.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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 5000 bytes
SHA-256: be159a5e75b2ca35117c62d98e4f33c2a700056bcac2004005e64fe7b27e730f
font_01_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 10276 bytes
SHA-256: c26cb92f969acb4a79f4ea51b355ee521d0d9dfb1b3d46985b19010af6c07728

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