Malicious PDF — malware analysis report

Static analysis result for SHA-256 c410355729808dab…

MALICIOUS

PDF

74.5 KB Created: 2021-03-02 20:20:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: be78aaa3f4b59bfdd49c87b1605e31aa SHA-1: 18cb4bfa633dd2d881a2473c56721c12fab566fd SHA-256: c410355729808dab47491e8338b3f23aba128f34bd0d8d97d894e53512500655
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 0.9998

Heuristics 5

  • 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 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://fokemale.ru/123?utm_term=arris+tm822+modem+for+sale PDF link annotation
    • http://chebsvet.ru/jerry_kuhnhausen_mauser8cfvw.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/how_to_apply_decals_wet.pdfIn PDF document text
    • http://update-win20.online/organic_chemistry_brown_7th_edition_solutions_manual_free1kk9q.pdfIn PDF document text
    • https://lafevisok.weebly.com/uploads/1/3/2/6/132683062/938898e7359.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/180822.pdfIn PDF document text
    • http://ogranicbio.fun/eu_general_data_protection_regulation_australia7ywc7.pdfIn PDF document text
    • http://perfectiona.online/kuwexopebejederesagissqnf.pdfIn PDF document text
    • http://xilenemivagola.mywebcommunity.org/troy_bilt_pony_7_speed_parts.pdfIn PDF document text
    • http://grigolia-studio.ru/what_is_the_average_cost_of_a_tankless_hot_water_heatersc62m.pdfIn PDF document text
    • http://sellamorem.com/ligomarebimakr8fz.pdfIn PDF document text
    • http://lovepositions.info/951752225240soze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewejatoxomo.rf.gd/tuzuzuvolegijogu.pdfIn PDF document text
    • http://nupudanotagudot.rf.gd/29857167462.pdfIn PDF document text
    • http://pekodumale.rf.gd/nissan_armada_2009_manual.pdfIn PDF document text
    • http://jijazofar.rf.gd/how_to_clean_astral_chlorinator_cell.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 5368 bytes
SHA-256: c8246a56f6d7052b75b7cac96d2214fd2ae2c934e712cfac062638a128c33d76
font_01_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 11276 bytes
SHA-256: abb4404c1d1dc12a95e376747805c33e3d0f779c8a03c7f149eef01534aae6ef