Malicious PDF — malware analysis report

Static analysis result for SHA-256 8166fdf3420393ff…

MALICIOUS

PDF

77.1 KB Created: 2021-04-05 14:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6c339bbff6b1941c8a28666f1549bce6 SHA-1: 5175e2fe1abc4e0b616415bc092f4ac8019464ba SHA-256: 8166fdf3420393ff3db2eeb536ddd7b33f94013c70b4fbcdeaad2b981cab3b56
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 0.9989

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://ponafet.ru/wix?keyword=macromolecule+webquest+answer+key+carbohydrates PDF link annotation
    • http://biweekamnf.com/punadakiwiojnbx.pdfIn PDF document text
    • http://dorightunion.com/bottesini_alla_mendelssohn_sheet_musichese9.pdfIn PDF document text
    • http://kebuwakuje.medianewsonline.com/apache_web_server_architecture.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://itasummer.fun/template_flyers_photoshop_freezqfk7.pdfIn PDF document text
    • http://telemprom.xyz/265849449953kbdk.pdfIn PDF document text
    • http://kobujiva.iblogger.org/ambari_kannada_movie_naa_songs.pdfIn PDF document text
    • http://gta-msk.ru/2006_sea_doo_speedster_200_owners_manualxqmcq.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/nuvukuvex.pdfIn PDF document text
    • http://phillipen.online/how_to_clean_debris_filter_samsung_top_loaderctppg.pdfIn PDF document text
    • http://funewiwawako.iblogger.org/14310679725.pdfIn PDF document text
    • http://watercart.ru/clasificacion_de_cuentas_contables_de_activo_y_pasivoh9rhb.pdfIn PDF document text
    • http://golden-charm.ru/what_does_lockout_mean_on_a_furnace1h5v6.pdfIn PDF document text
    • http://podarokinsta.site/negufy7ddp.pdfIn PDF document text
    • http://healsmall.space/xezanubwvxs6.pdfIn PDF document text
    • http://thedefenseforge.com/subizikegusosubezibupnf.pdfIn PDF document text
    • http://pufemebulod.22web.org/fuvawege.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/contoh_amdal_pabrik_kecapgo4ii.pdfIn PDF document text
    • http://shopsmmv.site/91661541794v6ejl.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
    • http://sosigajatotaxus.rf.gd/killing_floor_2_prestige_levels.pdfIn PDF document text
    • http://tijetefewojo.epizy.com/14896043913.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/b._ed_syllabus.pdfIn PDF document text
    • http://ranitirunom.myartsonline.com/principles_of_electric_circuits_10th_edition_answer_key.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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 5540 bytes
SHA-256: 30d87370ca7589e2cf62cd6391f5652c2bbd9b929a8dac22ed8c337c5fb99218
font_01_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 9528 bytes
SHA-256: 6071b523a9a6d7b2ecb3ad7aa7e8927cda49051e62865b366b7986008ccb67a5
font_02_sfnt_off000118c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f