Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7febce4408c7619…

MALICIOUS

PDF

90.4 KB Created: 2021-03-03 03:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 337fdabf3ce1b557d1a0431e32629441 SHA-1: dec45cf131ec716b7c8df7343691f9acdf06e5f8 SHA-256: e7febce4408c76195102d4c3c9ed45fb2bcf59e3a48190b521a26d3250a6bf7d
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/123?utm_term=why+does+my+bissell+proheat+pet+not+spray+water PDF link annotation
    • https://cdn.sqhk.co/guzelatolina/DWjcIia/67439336993.pdfIn PDF document text
    • https://cdn.sqhk.co/wirujurumugi/kTZibje/arcade_machine_repairs_melbourne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484154/normal_603839e87964a.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/NLjb7Fi/beat_street_movie_youtube.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/wizemux-juvanilipogof-tipifuzup-rovufosu.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/5jejhKn/nusazoxelenudupewok.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/ptrvjgj/tafojif.pdfIn PDF document text
    • https://vovinusowoxojik.weebly.com/uploads/1/3/4/3/134349833/juzudawupajegegi.pdfIn PDF document text
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/welifozipuwagobe.pdfIn PDF document text
    • https://cdn.sqhk.co/kakovavop/gd6je6o/72170529245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_5fd782eee52a1.pdfIn PDF document text
    • https://cdn.sqhk.co/rujoremebi/ifLjbvz/venaduxekijofujanezelepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fe1236dbae98.pdfIn PDF document text
    • http://netabemoli.22web.org/pfpx_flight_plan_template_guide.pdfIn PDF document text
    • https://nogovomavidel.weebly.com/uploads/1/3/1/6/131637041/809926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://borusatare.rf.gd/35377290652.pdfIn PDF document text
    • http://wefofumerari.rf.gd/jusaleragup.pdfIn PDF document text
    • http://wowifimeziv.rf.gd/online_application_form_of_ssc_je_2018.pdfIn PDF document text
    • http://lunofalogejutu.epizy.com/emperor_penguin_facts.pdfIn PDF document text
    • http://vorakufi.epizy.com/how_to_train_your_dragon_book_set_12.pdfIn PDF document text
    • http://rikovaniroxatox.rf.gd/rudurobidageziwubuvuzo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 5332 bytes
SHA-256: 40a935d743c520f4f6aecc73d27920a59b1aa2a689de979daaa2a55704c1806e
font_01_sfnt_off00012945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 10704 bytes
SHA-256: 32a34539adf02f268980438df4702c7e6231b4e6c40a3f836453bbeee7404b3d
font_02_sfnt_off00014dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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