Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a0c50a6f255c7f…

MALICIOUS

PDF

107.9 KB Created: 2021-02-25 16:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dbf59c0371ad9cf81cbd38b762e745d8 SHA-1: 7f87c3c817638dd676d22147e93cc7274569ec9b SHA-256: f2a0c50a6f255c7fd9ef2943dc5493d170d5313bb01171471a920358dca1ff0d
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 identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It utilizes an SEO redirector disguised as a study guide to lure victims to a malicious URL. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to download further malicious content, aligning with common phishing and malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/wix?keyword=one+crazy+summer+study+guide+pdf PDF link annotation
    • http://uchebnoe.website/where_should_carseat_straps_be_on_shouldersunnnm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452395/normal_601c5c104dba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_5fd97390103a3.pdfIn PDF document text
    • http://ital-girl.space/48093100579rz78t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393028/normal_5fdca372f1aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5fd322d435d4d.pdfIn PDF document text
    • http://itayoga.space/27132977549x46x1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_601f2c89a2bbd.pdfIn PDF document text
    • http://gojuvop.iblogger.org/39325723822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452851/normal_5ffea0aa1e453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451217/normal_6011f37e15a50.pdfIn PDF document text
    • http://bilkan.fun/finawaxidmgwwt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465133/normal_5fcb459b09c15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420776/normal_5fed00d418b54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bisazabe/autodesk_sketchbook_pro_pc_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/83883813715.pdfIn PDF document text
    • http://mitefunigesito.rf.gd/capsula_articular_de_la_cadera.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/79311240437.pdfIn PDF document text
    • http://jenabarove.epizy.com/helm_template_namespace.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/wapunuket.pdfIn PDF document text
    • http://rinonefor.rf.gd/booksmart_box_office_performance.pdfIn PDF document text
    • http://wedalavunobuwe.rf.gd/92200411644.pdfIn PDF document text
    • http://vamafawuf.epizy.com/craftsman_13_amp_circular_saw_review.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C99 5392 bytes
SHA-256: 8f17c9ec18afdd9aa2073982b8fbe536e53911568fcc68367d9f395e76c1841a
font_01_sfnt_off00016eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEA 10764 bytes
SHA-256: a76670ae05aa9fb9f2a8c566bcfe02bbb4b9a22062caf0a65b34afd67a746ab6
font_02_sfnt_off000193b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193B9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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