Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3ff205879be838…

MALICIOUS

PDF

73.9 KB Created: 2021-03-04 07:37:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 78eca196ac780c43fa0888fc4f5fdf45 SHA-1: de9791de8f0fcd2d29d447a891a921bb826fc809 SHA-256: 6c3ff205879be83879d5200c2d49bd5fa184afd91ffafdf14c6d017f6e734bf1
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains heuristics indicating it's a credential phishing lure impersonating Instagram. It includes a link to an SEO redirector, which in turn points to a PDF hosted on Weebly. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content. The presence of embedded URLs and the ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://katopogovalasa.weebly.com/uploads/1/3/5/4/135401177/wowoxosafelex.pdf.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/wix?keyword=view+private+instagram+account+no+verification PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5ff6cf1281486.pdfIn PDF document text
    • https://katopogovalasa.weebly.com/uploads/1/3/5/4/135401177/wowoxosafelex.pdfIn PDF document text
    • https://zowotojezef.weebly.com/uploads/1/3/4/3/134330732/zadasamovibiz_noreva.pdfIn PDF document text
    • https://paxuxitusokewu.weebly.com/uploads/1/3/1/3/131380341/vuwibuf.pdfIn PDF document text
    • http://kijuguwosaxo.22web.org/schlage_be469nx_cen_716.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/how_to_replace_the_igniter_on_a_furnace.pdfIn PDF document text
    • http://wopazav.22web.org/delete_a_worksheet_in_excel_2007.pdfIn PDF document text
    • http://gujufifirisin.22web.org/bond_lodgement_form_online.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/ratixifo/sitemedujoxanofu.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/white_laminated_plywood_sheets_uk.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/18170748589.pdfIn PDF document text
    • http://vexowiwoputam.rf.gd/daxezepokuzoj.pdfIn PDF document text
    • http://mokineso.epizy.com/honing_guide_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/action_hollywood_movies_in_tamil.pdfIn PDF document text
    • http://nigugolesaxof.rf.gd/stroke_fast_track_guideline_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/what_is_the_top_rated_cordless_leaf_blower.pdfIn PDF document text
    • http://jaxirelogalitis.epizy.com/12826237548.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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 5420 bytes
SHA-256: 04f2e048c9b71e056f40a3fdc8403a556b48be1fbb29dd61ead3a4d871887137
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 10428 bytes
SHA-256: b1091daa25139c181035a0ccb539ce5192079725fcacf1553d2c2d1ec448d128

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