Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99134b8afe366ce…

MALICIOUS

PDF

73.9 KB Created: 2021-03-30 10:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 09502162dcc796fa5234e9af9f289f8a SHA-1: 5b38f1a04342a4e69a3238a43b1fc3f3b9288205 SHA-256: c99134b8afe366ce70f34fc0fb5084cb1087688325aadd04656f807b050c5822
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 0.9998

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://mezovuduw.ru/strik?utm_term=how+to+get+powerbeats+3+to+pair PDF link annotation
    • http://vijevejumozugim.sportsontheweb.net/anger_iceberg_free.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/jumurobezeped.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafokenenore.rf.gd/how_to_sew_a_mask_with_nose_wire_and_filter_pocket.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_0c696f93be3f404e8fb2df59fe52064e.pdf?index=trueIn PDF document text
    • http://xaguxebijop.epizy.com/architect_s_studio_companion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc10f0c-4341-49a3-816a-01f11c8ade9d/dark_souls_2_scholar_of_the_first_sin_walkthrough_fextralife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9622e7ed-c5c3-4f1c-866b-2b762b899e43/encyclopedia_magica_dd.pdfIn PDF document text
    • http://fonivez.epizy.com/65092876709.pdfIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_0747db5b27cb46ffa01235a9eb3b7e62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca95a38-d2be-4fa4-a815-4651e15267ae/lobexebavafutarusaj.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_b9d4945802ca480c9b5240ab3fabc448.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_efd1872f07ba47a5b64d955566950569.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_a6c38bde8f75487880784c64d25fa39a.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_dbdec89f6f924bea8c2d3bd269605114.pdf?index=trueIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_631e1746866f4feda9f46ee4e3b8d2e4.pdf?index=trueIn PDF document text
    • http://sededuvox.rf.gd/87576059421.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_75d20ecf65f341cca1980832187728b1.pdf?index=trueIn PDF document text
    • http://kepofif.onlinewebshop.net/life_goes_on_quotes_images.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_5f68b99a108e4576bff8b054379d7ec9.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_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 5312 bytes
SHA-256: 1ad0b97da1618b498b4c8c56b44dc847ba2c8745aaa78e988f8d9d7ae9b5c817
font_01_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 11604 bytes
SHA-256: 195b508850a1292fef18d4b9e19ec29cf124c55aeb2d897c23c6e44761bf7f48