Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a2aa0bba1d0d05…

MALICIOUS

PDF

69.9 KB Created: 2021-02-17 22:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4626025800011379043c54923b5fdc12 SHA-1: b63acf8bbc25c134e2d81b41e441d6da0ecd1046 SHA-256: 43a2aa0bba1d0d05f9cd582a2dfcfa2d841e63220fa5bee9f6381b3195c9716c
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text fragments suggesting a commercial lure. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=baby+groot+dancing+toy+for+sale In PDF document text
    • https://cdn.sqhk.co/puninuzono/eZfhb7L/birds_color_by_number_pixel_art_coloring_book.pdfIn PDF document text
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/dasadirosomabufebir.pdfIn PDF document text
    • https://kuvolobogon.weebly.com/uploads/1/3/4/0/134012650/3752094.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/zozapiredamuk-ruwafuf.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/UDgjff5/99932252887.pdfIn PDF document text
    • https://lipamonevarila.weebly.com/uploads/1/3/1/4/131453989/lusipurejojaj.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/26LfjFt/10523204652.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/lvhgPbq/getositakowamalepaxowuka.pdfIn PDF document text
    • https://jewinovezuxumat.weebly.com/uploads/1/3/1/4/131407424/bumirutuwajider_tudufusagotux_rulesofil.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/kozewuposoridil/pazinokulubobapopake.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/vanutemadovowigiwirob.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/57033433267.pdfIn PDF document text
    • http://pitikepaz.epizy.com/halloween_party_flyer_template_word.pdfIn PDF document text
    • http://wokixewo.epizy.com/kimubekulizufi.pdfIn PDF document text
    • http://funazowo.rf.gd/bhoothnath_returns_full_movie_in_hd.pdfIn PDF document text
    • http://namutogenasokab.epizy.com/48852115872.pdfIn PDF document text
    • http://xesogopobatobop.epizy.com/24670426977.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_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 5480 bytes
SHA-256: c4eb4504b43f26b382fec122883720a64899acf0fff6c067d8578c9e36d8ce04
font_01_sfnt_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 11104 bytes
SHA-256: a028ebb62c9f3cfc91bef99d3d34ddb071c0ab1f84b8c6fc3a46a1d85a92a0b5

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