Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f173267144693b5…

MALICIOUS

PDF

85.0 KB Created: 2021-03-24 12:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0270f2494a78dcf4ebbc0f15d67e5c85 SHA-1: 229691d3fc0169b8189d5a4d80810986615a67ab SHA-256: 4f173267144693b55bf21b564830c54febe36cacc6a667a5215c756540b54667
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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=macromolecules+carbohydrates+worksheet+answers PDF link annotation
    • http://braco.ru/13737112669akq98.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/collage_photo_editor_for_androidk9pnt.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/jj4E2hh/the_office_episode_where_michael_prank_calls_ryan.pdfIn PDF document text
    • https://cdn.sqhk.co/tilesoxeg/aeLjcOY/instructional_coach_resume_template.pdfIn PDF document text
    • http://tusuvopub.22web.org/the_jesus_bible_artist_edition_esv_leathersoft_multi-color_teal.pdfIn PDF document text
    • https://cdn.sqhk.co/nezupusovefi/yhi8zig/convert_customary_units_of_weight_worksheets.pdfIn PDF document text
    • https://kuwuvolabakeg.weebly.com/uploads/1/3/1/4/131407812/1f49ed76df28.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/pobefodajusu.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/jatetebub.pdfIn PDF document text
    • http://ru-1.casa/bozemodazeuiene.pdfIn PDF document text
    • http://xsafak.com/gis_vs_gps_ap_human_geography20bcg.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/43jbAid/identity_vs_role_confusion_real_life_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/c5IUigT/zorobixobifojekarafu.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/VjgvMjb/free_mobile_phone_wallpapers_and_themes.pdfIn PDF document text
    • https://cdn.sqhk.co/radavesix/l8lBRg6/34333458687.pdfIn PDF document text
    • http://mivakoxukike.22web.org/flowers_in_the_attic_1987_parents_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesiwafo/cigGgiG/commercial_ice_maker_for_sale_used.pdfIn PDF document text
    • https://denogowozule.weebly.com/uploads/1/3/5/3/135326247/6862660.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/gTt0A3h/radiology_regional_center.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://totaraxidob.rf.gd/fizagoberubajuvujunape.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/campus_life_game_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/juwotujet.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/como_limpiar_sillon_de_tela_blanco.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_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 5584 bytes
SHA-256: e60bc46b7c2797f80e625f2dd65e81efe35aa40d98c9ec8510894ebeb6d15c8a
font_01_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 10864 bytes
SHA-256: 09781323ebdcf3ff211c3c3f348f23217d583b798cafccc914b818a8a48fb256