Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f59ef85055c944…

MALICIOUS

PDF

88.2 KB Created: 2021-02-28 11:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8f490b88b7ade15c9fba216acd2b7c35 SHA-1: da83f6f893bce3ee6507e450260f314d5d72719c SHA-256: 55f59ef85055c9443f231fca175ed3a9bb08172fa2413d39c061a68e350fe0cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs, with one prominent URL leading to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'solving quadratic inequalities algebraically worksheet answers', which is likely a pretext to drive users to malicious content. No scripts were extracted, but the PDF structure itself is being leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=solving+quadratic+inequalities+algebraically+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471514/normal_6011b46955f08.pdfIn PDF document text
    • http://notdull-eng.online/wofiputodekelotiz0x5j.pdfIn PDF document text
    • https://dubiriji.weebly.com/uploads/1/3/1/4/131406762/7609032.pdfIn PDF document text
    • http://nat-yoga.space/reflexive_verben_dativ_akkusativorr2u.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/how_to_write_an_assessment_example.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/nimabiwijiwod.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/tejatugewesug.pdfIn PDF document text
    • https://dabosimupit.weebly.com/uploads/1/3/5/3/135397997/dakujovo_zavetodawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5fcd5ba0d962b.pdfIn PDF document text
    • https://kapuwibipu.weebly.com/uploads/1/3/0/9/130969563/6a7a5cc.pdfIn PDF document text
    • http://xemuzaxu.22web.org/60261562163.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/6549694.pdfIn PDF document text
    • http://tokigarodam.22web.org/77567703257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5fdc097ba9b1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiluxusimutine.atwebpages.com/our_god_reigns_chords_israel_houghton.pdfIn PDF document text
    • http://gafodix.myartsonline.com/niebla_miguel_de_unamuno_capitulo_31_resumen.pdfIn PDF document text
    • http://gizivafufet.rf.gd/67306713461.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/2000_ford_ranger_mpg_v6.pdfIn PDF document text
    • http://jejivosijej.rf.gd/bteup_marksheet_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 5888 bytes
SHA-256: 3f7ea94b43ea0be4c9cae90c601efde22d3f49e0f442598d1f0c3a3d6e73ccf8
font_01_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 12704 bytes
SHA-256: 6f9cc56dfd96d9122f6acdccd2dddd6dfeade3fa7f0c0716133c38e22e3462d2
font_02_sfnt_off00013b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B55 16144 bytes
SHA-256: f7f944af48a1f29a4fc81369acbb7667dc0c0bb312d09d0e658341ed730dbf86

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