Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d20ce1975dd29d…

MALICIOUS

PDF

73.0 KB Created: 2021-03-28 00:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d4f152e034d2ddd083c8107b1dca4b1b SHA-1: 1d4e943153e2f4e44b8e8d9f3d16d2274e819ec0 SHA-256: c8d20ce1975dd29dd75ad8ed6cba90a183a59042fc113903fe02f5c6f4eeeb62
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 0.9996

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.
  • 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://botokaw.ru/123?utm_term=congenital+hypothyroidism+guidelines+iap PDF link annotation
    • http://leledup.mypressonline.com/is_wendys_breakfast_sausage_pork_or_beef.pdfIn PDF document text
    • http://jotusimemirido.sportsontheweb.net/xozigoro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://neveket.epizy.com/stokke_crib_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae755789-6fdd-4cc9-8c67-18e9b6fed3ce/33206288453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6367465-0d62-4a01-b780-43234a892626/vibiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903b29bf-c6f2-44fa-8fa8-8d5783a70361/what_is_180_degree_viewing_angle.pdfIn PDF document text
    • http://fizojigijuzad.epizy.com/votajudosagu.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_e7478e3c9bde4f4f863d3ea951efe7e4.pdf?index=trueIn PDF document text
    • http://bugenerefajujus.atwebpages.com/72828363122.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_8f1f5333744546ce950f622d623f86bb.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_039eb7bf763e45008ad76a12337ab6a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb167a39-0a0e-4cd3-af9d-89195bb7595e/lolipu.pdfIn PDF document text
    • http://wuxekusoz.rf.gd/81665802128.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_1cbe4e7cdb4942dfaed217c3d47d1cae.pdf?index=trueIn PDF document text
    • http://lipesomidu.epizy.com/the_bookish_life_of_nina_hill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2baad7f8-cc24-4376-b8b4-2db62c1dc3a7/riwijigoxidewax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250d17e7-1908-4950-b5b6-c87b55293f19/which_element_has_2_valence_electrons_in_the_2s_sublevel_apex.pdfIn PDF document text
    • http://zelixedamaxux.rf.gd/61959666198.pdfIn PDF document text
    • http://jupetovujek.epizy.com/free_responsive_grid_html_template.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_05e6445f54b44f20ba4d817ce85f51b6.pdf?index=trueIn PDF document text
    • http://xesiduzivodugi.epizy.com/molizorerex.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_off0000d1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 4456 bytes
SHA-256: d3da049dc18f0d47fcd3bd3e96548b5b94b6c1f6969b3b026f41db87064dd672
font_01_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5380 bytes
SHA-256: 2280bc9c9ac9dbb8ee585befe6c5c4d015e6199fe8a82fc4582a0be97d1742e0
font_02_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 9932 bytes
SHA-256: 85b3c509e6070412b4c8d8500f4357b45cde1d76e01870b8bda441d4d9d8b57b