Malicious PDF — malware analysis report

Static analysis result for SHA-256 9543bf1f3a46f651…

MALICIOUS

PDF

114.0 KB Created: 2021-01-23 12:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 59904d276aa317f651352f6d284f21bf SHA-1: 2c45e686edb69539cd53e38c459047dbaf1d2726 SHA-256: 9543bf1f3a46f651ebbec3bd73ebac66996dcfe85b00031700706fb71371dc20
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF uses a lure of a 'chemical formula worksheet' to entice users, employing SEO redirectors to obscure the final malicious URL. The document body contains numerous URLs, many of which are associated with benign content, but the presence of a high-risk heuristic for SEO redirectors and a ML classifier flagging the PDF as malicious indicates a phishing or malware distribution attempt. The document's structure and embedded URLs suggest it is part of a phishing campaign designed to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Travel-support phone-number stuffing scam critical SE_TRAVEL_SUPPORT_PHONE_SCAM
    Document repeats phone numbers in airline/travel/refund/support language, often across multiple regional phrasings. This matches SEO/support-scam PDFs that impersonate airlines or travel brands and route users to attacker-controlled call centers rather than a normal travel document.
  • 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://cdn.sqhk.co/sojetaji/ijlXhcP/sculpture_garden_mpls_mn.pdf In PDF document text
    • https://cdn.sqhk.co/xofozomuwef/rhlgfQ5/dekari.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/gibmBdb/nimidibesesirerifar.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/zhhqj6l/block_puzzle_classic_plus.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/eogd7jf/boomerang_movie_score.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477916/normal_5fd34d5b245a4.pdfIn PDF document text
    • https://cdn.sqhk.co/birugafomafo/99hfjjo/gamevepovusare.pdfIn PDF document text
    • https://baarspo.ru/123?utm_term=chemical+formula+worksheet+pdfPDF link annotation
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0001801b.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0001801b.bin)
    • https://s3.amazonaws.com/dewazewokib/meduruk.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/allcast_pro_apk_cracked.pdfIn PDF document text
    • http://ruzovufu.epizy.com/virivugalo.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/zususuzitowa.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/attestato_di_conformit_fisioterapia.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/audacity_lame_cnet.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/50414761839.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 extracted file (font_00_sfnt_off0001801b.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001801b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1801B 5456 bytes
SHA-256: 93d2fc49f25437d63c3d185d98fd23da5d99c10c8c104a79cdac5e3fcb6696f8
font_01_sfnt_off0001928b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1928B 12404 bytes
SHA-256: 20b8fe3629f74b7fe183aa02e44657fd4767b290d56bd0b4d19641b7cea299e5

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