Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4baf1e404d40f85…

MALICIOUS

PDF

72.7 KB Created: 2021-04-16 04:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3f6ea84541f3ac849aa42195026243be SHA-1: 730946f022c18eff896f592ef39414b5fdec216d SHA-256: b4baf1e404d40f851abf74b5e9d2cd4b3371444a96ad9ef16e0a2e78e7a8d0a0
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=batman+the+killing+joke+comic+book+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451954/normal_6005ba85eafc8.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/4860102.pdfIn PDF document text
    • http://gmetry.online/how_to_convince_someone_to_have_a_3_waydvtdo.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/145f97585507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_60192d5e5a9bf.pdfIn PDF document text
    • http://workbykoder.xyz/97086642970s4vtb.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/b7ca6fb2-e27b-4ca8-86df-6938afd9b8cd/85492549724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f936c401-ca20-4738-8395-5f5b47377f77/how_to_add_html_code_to_wix_page.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/bexunosufarezopedido.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/which_chromebook_is_best_for_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c86350d-2f04-447b-875b-81076740d3c8/what_are_the_7_deadly_sins_in_islam.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_37c6e75ca276448893b55e6e9e64e1cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/67051678019.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/lovimil.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_6fc4dc72849b43baaa5b6f6a6cd23992.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb58610-ceb4-44ad-8df2-55cdcc8f1212/sql_cookbook_oreilly_github.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_12759c34c3f3469e983700f488ceb533.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujixus/zmodo_nvr_not_recording.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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 5716 bytes
SHA-256: 71a60283de2326a955190773253ad5ca51f9b2dd7a3f53e65c4c3e0f82f5bb57
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 11308 bytes
SHA-256: ecc47976bed73b7e2c207cafc729e3b555ba811cda289657a16231dcf63a3604

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