Malicious PDF — malware analysis report

Static analysis result for SHA-256 b454b4336b982e55…

MALICIOUS

PDF

80.4 KB Created: 2021-03-18 05:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7691a8d1e85c0fc02175eec8c854b1bd SHA-1: b1e089f788e57e5fc368e80a696202a1c043d89a SHA-256: b454b4336b982e55f35f522127b5597332ca37d02e5020fd5bd3e86fdbf8aa21
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is detected as a phishing trojan by ClamAV and an ML classifier. It contains an external URI and an image lure pointing to a redirector URL, suggesting a phishing attempt disguised as educational content. The presence of embedded URLs and the overall detection indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=phonological+awareness+activities+1st+grade PDF link annotation
    • http://shop-you.xyz/telufcplnc.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/larva_aedes_aegypti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381534/normal_5fe420586feaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_600f2d1c95714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473963/normal_5ff0df30d6e16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496815/normal_5ff3c9cb0a672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5fd132b84376a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493916/normal_5fc6b56317f1d.pdfIn PDF document text
    • http://poradoit2.site/lodaxolimixrq4rx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_602d4fbff3f0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383795/normal_5ff497e3c8cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6012e1f69269e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_601dbfcbc18fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fd7b8de079aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470692/normal_6032150e00a6e.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/divina_commedia_libro_scolasticoi7wxn.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/perogifatapu.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/rivazixexuguri/number_format_java_2_decimal_places.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/quem_tem_que_pagar_imposto_de_renda.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/alchemy_meaning_in_malayalam.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 5404 bytes
SHA-256: 14cda099c660244478fbf7f307f5ab1a97709d0b9956cd52c29c7052b63728ea
font_01_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 10912 bytes
SHA-256: 3c7c6f8df4da547c3c4c216c944de629aed84ec92033efba618c45a740e5bd1a
font_02_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1

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