Malicious PDF — malware analysis report

Static analysis result for SHA-256 93330507dbf653c4…

MALICIOUS

PDF

80.0 KB Created: 2021-03-28 14:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a82addf847536b0949e65c28eb227fd4 SHA-1: 5529bb2efa3dfadaabd3e976820f1037d65e9a7c SHA-256: 93330507dbf653c4720cde1e49e7e708795e36b97a2e988c86ed2e3008a2032f
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 0.9993

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://ponafet.ru/award?keyword=basic+electronics+engineering+book+pdf+download PDF link annotation
    • https://napaxivate.weebly.com/uploads/1/3/0/8/130813999/xusepet-tonofijerisobot-lenidixo-topifejefitifi.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/4244903.pdfIn PDF document text
    • http://lexusesadedebaz.22web.org/que_es_carboxihemoglobina.pdfIn PDF document text
    • https://kexefofivib.weebly.com/uploads/1/3/5/3/135305266/laxemojodaj-waminik-mutetafuta-kijofafule.pdfIn PDF document text
    • http://50offstore.info/how_do_you_make_a_concrete_design_mix5ixfh.pdfIn PDF document text
    • http://unreguezff.rest/ethics_for_the_information_age_7th_edition_download8biru.pdfIn PDF document text
    • https://valetapos.weebly.com/uploads/1/3/4/2/134265584/gutunuxuwejizepetas.pdfIn PDF document text
    • https://visopitolunew.weebly.com/uploads/1/3/1/4/131483219/mofad_farafenuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/penale/what_is_the_electron_geometry_of_co2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a727ef71-0483-457d-8395-27e4ce2b3433/rukiseniribakizagif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744b355a-3b2c-4f92-aedc-ceca54c436b9/junepapugimawibuzisitosi.pdfIn PDF document text
    • http://dunurabese.rf.gd/soribo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23b420e-24d6-4a0a-a1bc-4b3fee034a2e/84510603950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906e8e49-ec08-4eb5-b7ec-12eef3168356/the_dialectical_behavior_therapy_skills_workbook_a_new_harbinger_self-help_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/26336962284.pdfIn PDF document text
    • http://xisomusexiz.rf.gd/64646578783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133d6194-95ba-4ee1-a607-ea299198ff84/zezetenukeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdfc16d4-4a27-4881-886a-cadca6040dfc/algebra_lineal_matriz_identidad.pdfIn PDF document text
    • http://buximonerivib.epizy.com/balloon_movie_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0013ca03-5496-4dbe-9fc9-7b72c0953547/the_hunger_games_catching_fire_book_quotes_with_page_numbers.pdfIn PDF document text
    • http://vorakufi.epizy.com/xurojazijitodezirunodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9713f26-bc2a-42bd-92bf-9547662dd861/mumugowetizarigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6eec0fe-6482-42a0-9e5c-fc7dacc4cfd9/what_are_the_lowest_calorie_indian_dishes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d007581-82ad-42c7-87b6-2512589347a7/normal_blood_gas_values_australia.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_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 5668 bytes
SHA-256: d6ca4fa7a42395df45ba033443a474b515a5e44d0b9fbe460d7eff4af27bb19e
font_01_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 10192 bytes
SHA-256: 9225211f0254cead7a4e018659ad5cb5caf41e92975710ebb1d3d6fb1753fd72