Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e315e651c8affa…

MALICIOUS

PDF

80.9 KB Created: 2021-05-29 04:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 895a67f390a41d4121a7c3b526d515dd SHA-1: 29616cbb51c7331223f2c1488faef2f8cdfcaccc SHA-256: 84e315e651c8affa0918b1716d5eb813a4e204142dc73d9f7f63d58c1982cff4
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV and an ML classifier as malicious. It contains a high number of external links, with one pointing to 'bologen.ru', suggesting a phishing or SEO manipulation tactic. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://bologen.ru/123?utm_term=background+images+dark+blue PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483602/normal_6050b89a72c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474978/normal_600a17ec53848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5fcd447c59007.pdfIn PDF document text
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/cd9e8.pdfIn PDF document text
    • https://sagejajake.weebly.com/uploads/1/3/5/3/135303377/sixemimi_goxis_goferugizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471092/normal_6009d7ca7392d.pdfIn PDF document text
    • https://dijemafewume.weebly.com/uploads/1/3/5/9/135992897/4483134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_6044931c1584e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_606c1627d5f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_60206f5a31fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_60559915ad58d.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
    • https://uploads.strikinglycdn.com/files/9be20bfc-8319-40ca-b435-abc4d84c6580/82464814015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cd02cd-551b-4e5f-85f2-5c6d7ded45ae/85501407128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb269360-6449-46e8-962e-05a6168bb830/resumen_del_futbol_a_sol_y_sombra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ba6f6b-b015-4f69-8c9d-3ff99045183a/what_reading_level_is_the_land_of_stories_beyond_the_kingdoms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f3c186-b4ff-4075-b670-13b617908511/4748993607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed21ba14-30b9-4bb5-ba68-5458a09950fb/bissell_spotbot_pet_deep_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f009c35d-9a4b-482f-a2cf-ee99003f57ff/hp_officejet_4500_all-in-one_printer_-_g510g_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a14c7b-1250-4aed-970e-b836fbca4b8a/vidozobi.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_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 5316 bytes
SHA-256: e85e00a61dbcce9be98e26065e6d4d2d1db29f9a8d8ad28e8ad1499f61cfde12
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 10548 bytes
SHA-256: 9c208ff529ea67959ddaa417716e735abf5cc8e3a34486636f5e475a0181bfa1
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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