Malicious PDF — malware analysis report

Static analysis result for SHA-256 5372f1000f1e9250…

MALICIOUS

PDF

78.6 KB Created: 2021-03-09 09:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0a828d101a838d2fa37f369067f94962 SHA-1: c8f3826acdbbd13b3e81ece0f5d3d1dbe32e410c SHA-256: 5372f1000f1e92503bdaced8e78552b5c6aa29431b4920e2bee4c7528b7339d6
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs, with one prominent URL pointing to 'seumenha.ru' which is flagged as an external URI. The document body, though heavily obfuscated, suggests a lure related to 'study guide answers'. The ML classifier strongly indicates maliciousness, and the PDF structure exhibits characteristics of a link farm on disposable hosting, further supporting a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/wix?keyword=speak+section+2+study+guide+answers PDF link annotation
    • https://cdn.sqhk.co/vusutazomaga/5uPoUSv/32354257804.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/40413816290.pdfIn PDF document text
    • https://lijokojojet.weebly.com/uploads/1/3/5/3/135333606/lufuvosaj.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/where_is_the_pump_filter_on_a_whirlpool_washing_machine.pdfIn PDF document text
    • https://fapixuguxoga.weebly.com/uploads/1/3/1/0/131070829/juweboxukif-komim-sepimofonured-lusazufuwafepox.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/whirlpool_gold_quiet_partner_iii_replacement_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/ygcLjcS/merriam_webster_dictionary_download_mac.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/curso_primeros_auxilios_psicolgicos_uab.pdfIn PDF document text
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/2308202.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/4378290.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/telasebisu/avanza_tipe_e_manual_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/bridal_chorus.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_38920cf540bf4f3fb1dac7824da666c1.pdf?index=trueIn PDF document text
    • http://mafonevaverazux.atwebpages.com/karerogawinewejax.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/volimemuwewoxorefezarinal.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_1490e117dd8942afb9c6ac979cd8c33c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/warframe_jupiter_junction_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/lorakifalanubilix.pdfIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_04f24af34b584776b45b232619f88a61.pdf?index=trueIn 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_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 5700 bytes
SHA-256: e7ba5ad556dc7b756169c7df6ebb61383760adc04308853e4b9b084f8b191a3a
font_01_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 10460 bytes
SHA-256: b3928c651d79a5c65d76804586875919e39190f7b0cbbe5ac85eeeb3c231b9e9

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