Malicious PDF — malware analysis report

Static analysis result for SHA-256 196c28c237d50c4b…

MALICIOUS

PDF

72.7 KB Created: 2021-03-20 21:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9ed536378a56a02c9ceeeb542c30b761 SHA-1: bc8c93c20bb5504b2a9ab4f50916a1e1e908acaa SHA-256: 196c28c237d50c4b2b4f593c88c5f0043f51d64328f71b184c2131ab51deaac6
204 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a prominent one identified as an SEO redirector likely used for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' lure further supports a phishing attack pattern, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wix?keyword=codingbat+array+answers PDF link annotation
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/951acf.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/3485266.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/sowepet.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/9875ff108e.pdfIn PDF document text
    • https://cdn.sqhk.co/mofisozulud/MJ3hhjh/13530133093.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/djLghcy/hago_lite_app_download.pdfIn PDF document text
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/mesosedozivufaxixa.pdfIn PDF document text
    • https://cdn.sqhk.co/lojegalivo/h8hfBji/archipelago_presets_download.pdfIn PDF document text
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/lujumud-sijaxugisotop-fezevusetaw.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/wlqjfO1/ruzovus.pdfIn PDF document text
    • https://wokonupojelofa.weebly.com/uploads/1/3/5/3/135351156/d7f382c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_bd2cd056281d46ffafb9b8e3e285cc25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/cabell_county_magistrate_court_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/iso_31000_certification_cost.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_4dc23c6687af4eaa99585f3e73e1f99d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/omnibus_budget_reconciliation_act_of_1987_nursing_home_reform.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_d3a1f49c236c485ca480d3321a11396c.pdf?index=trueIn PDF document text
    • http://bavidatesudujig.epizy.com/picsart_fullpack_gratis_2018.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_a1cb2721e9524c86aae7758a73de761f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanalovum/dasok.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/95721860179.pdfIn PDF document text
    • http://mowiwanafiv.epizy.com/37052750748.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_8cbd18bbf059439fbff41f4948f9da55.pdf?index=trueIn 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_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 5200 bytes
SHA-256: 665ad6b333dd266f3afb37fb59bf5ea5a2eab446ebf057fcdf8ea3e406ff5fc4
font_01_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 10924 bytes
SHA-256: 9c9e20764ac1f8717876a064a7f9e4a2626655e894f2ae41f6377e08bf7674cc