Malicious PDF — malware analysis report

Static analysis result for SHA-256 e231c43bae5672ad…

MALICIOUS

PDF

66.4 KB Created: 2021-06-14 12:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9c23cc11ad1778c78d1a165a03a7cbd3 SHA-1: e7f7a6259088cae68e84d1e8b2d1d4a611b565af SHA-256: e231c43bae5672ad66ef5ce649c15d51e4a96f045d9892206eae930b63283dcf
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to redirectors and SEO link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to external malicious content.

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://crysiq.ru/pbw?utm_term=spiderman+sticker+png PDF link annotation
    • https://kizatoruzosij.weebly.com/uploads/1/3/0/9/130969146/2e8ec1143f25ea7.pdfIn PDF document text
    • https://retagavit.weebly.com/uploads/1/3/4/3/134363188/gaputatenowawid.pdfIn PDF document text
    • https://vefoduga.weebly.com/uploads/1/3/5/3/135302220/0513d6e8eeeb.pdfIn PDF document text
    • https://daxolefuziru.weebly.com/uploads/1/3/5/9/135963055/zoxofegizos-zekilofami-xamisajujodutav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bcab9bd-70d1-44ca-b863-ee204bdf699b/zokenep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1a3703-bb66-4379-a98e-c3bb209167a1/71255689965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e2edbf-c228-41b9-bc5d-1c2c14e9c31e/zasonasixajefilepiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d72b03d-a328-42a9-a6a3-0506226aa11d/computer_repair_flowchart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f4ddba-69cb-41bd-848f-c742cef11850/vejasedetuleragefi.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/145038753/wazibesedijivobalater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a1a73b-5511-44f2-83fc-356a6b54f74a/how_to_remind_someone_to_take_their_medication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18a139a-a027-4a94-a6c8-4db7788f23a2/which_bollywood_actress_is_the_highest_paid.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/ben_10_alien_force_vilgax_attacks_psp_cheat_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d332e7e1-46a6-4f9a-808f-ed6555e947ff/75720448179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ee7538-c965-4f10-b1c3-d5c89c28d7cf/87968748013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e5b4a8-f94e-4e21-b887-49c32d4724bc/36784044859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c8d956-0e14-4bf9-a4b5-067268ad02ae/31848832433.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_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 5528 bytes
SHA-256: 202d305f03b03ea6434212052f8876b3503ee8a8b80c3c38a7d91894d97d59bd
font_01_sfnt_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 10072 bytes
SHA-256: 7e872a37c5be141e56e177911dea6c61ad91a063b6234545b354c20803817cd7

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