Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ee7771590e7d2c…

MALICIOUS

PDF

181.6 KB Created: 2021-04-08 01:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d9da0ee39e60e1702e797e61cae0ba7b SHA-1: 918b4ff2da985fedb0275b2ccee2209afe5efa13 SHA-256: c6ee7771590e7d2cfe1c55219261b78bfa67f263a0d7272c4036bbe69c859cc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/123?utm_term=complementary+medicine+an+overview+reading+passage+answer PDF link annotation
    • http://xanusojuruxu.sportsontheweb.net/diccionario_de_administracion_de_empresas_gratis.pdfIn PDF document text
    • https://vuveresob.weebly.com/uploads/1/3/4/5/134589217/5695379.pdfIn PDF document text
    • http://rigipufefe.iblogger.org/1080p_tamil_dubbed_movies_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/fAha3fz/making_ice_cream_in_a_vitamix_blender.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/hcgfjae/gw2_t4_fractals_guide.pdfIn PDF document text
    • http://sejixuwitu.22web.org/31775357571.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/4689751.pdfIn PDF document text
    • https://cdn.sqhk.co/poladejug/mgejaic/15173846125.pdfIn PDF document text
    • http://dajexori.mypressonline.com/los_5_lenguajes_del_amor_libro.pdfIn PDF document text
    • http://zavolofa.mygamesonline.org/introduction_to_logic_irving_m_copi.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/ginutu/storytellers_handbook_to_the_sabbat.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/linux_programming_environment_book.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_a4a80a0ee2db41d491c96076fe98e828.pdf?index=trueIn PDF document text
    • http://silapopo.epizy.com/rarujolulebapewiw.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/phoneme_chart_english.pdfIn PDF document text
    • http://wuduzukatej.epizy.com/iggy_pop_the_idiot_deluxe_edition_review.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_cc72161de8b64129a2d5aa9cb4b19db3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixolose/guided_math_stations_grade_4.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/ggplot2_cheat_sheet_r.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_off00027193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27193 5552 bytes
SHA-256: 7060e9f06e233bbc0d971bcc297d519b78f3fdf25ea7d5d6aa9eada23452b706
font_01_sfnt_off00028472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28472 14320 bytes
SHA-256: 012e3d4d6e5da42d67f9ef746e706d8944edcee82dff3d5ccc9b5a5a0d57a7fd
font_02_sfnt_off0002b24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B24C 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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