Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a82f09bc4e1d1a…

MALICIOUS

PDF

80.3 KB Created: 2021-04-06 00:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4de93715cb9f558ab866b66c99dfad49 SHA-1: 70d6299977b494805a6b9c13c21f4160e5fb325f SHA-256: a6a82f09bc4e1d1a83d7975deff85a434b80a1e4e4938785b336353f05616884
186 Risk Score

Malware Insights

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

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 6

  • 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 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://xezojetit.ru/strik?utm_term=2013+dodge+charger+rt+wheel+specs PDF link annotation
    • https://tetiwaxope.weebly.com/uploads/1/3/0/7/130776033/kibaminizanaxu.pdfIn PDF document text
    • http://damvglaz2.xyz/nexotobuzenekewog92m6.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/1046783.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/watch_50_shades_of_grey_online_free_vimeozx6hg.pdfIn PDF document text
    • http://hyipinvest.site/nothing_stops_a_bullet_like_a_job_is_the_slogan_ofkys28.pdfIn PDF document text
    • http://fruktovik.com/59093092223nbvbi.pdfIn PDF document text
    • http://effektzhizni.ru/wokizaderolo3p.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/papojamegi-pigiga-timerorugoti.pdfIn PDF document text
    • http://ru-dev.xyz/mazigep8gm2s.pdfIn PDF document text
    • http://reznitskygallery.com/35000794786yanqe.pdfIn PDF document text
    • https://bewirupudafa.weebly.com/uploads/1/3/1/6/131607000/6973803.pdfIn PDF document text
    • https://simisidexibasu.weebly.com/uploads/1/3/4/5/134502995/8ac75c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_16860baff82a463eae5ef63cf03845cb.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_d37bd5843784419f9b62984b928274bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/654339cb-eed8-43a1-bb62-207867fe16d4/what_are_the_broad_categories_of_aggressive_behaviors.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_1a1973e8763c4f29b6cbb1f1a08820d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d93dd6-50a2-40ed-aece-d1b2707f5ae1/fowiridizimonap.pdfIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_0e0eaf4743b34a6991535c5422f62f95.pdf?index=trueIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_e31786f69d984556b0c4bae43891aada.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_00c82b9b52a447948295478e65594fc5.pdf?index=trueIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_e1fda509d5334c769d07f1bef9866580.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_4d838ddd675f4eb29a48da36361cfa58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46caca6e-22f8-4bfb-bc74-2456591412cf/how_to_set_up_bowflex_sport.pdfIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_214b45d109f84284bda35a88add6f729.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_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 5820 bytes
SHA-256: 7eefea4a7289768abc79dabeba0c7d89826e76b80f27808d2b9bbeadd9daffdc
font_01_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 11324 bytes
SHA-256: a0c1ffdb303b43ef83b2dc8c1d00ed2292f5e583766b2829f8d30873f6a357c7