Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e688ad552116ec…

MALICIOUS

PDF

80.4 KB Created: 2021-04-05 01:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f9e47532c3d8b870a8f80b3464892a59 SHA-1: 5487ccc2da74339d728babe8a2a7992e5b4ed3f3 SHA-256: 45e688ad552116ecaf35479df3fe49fa3d2907add3b19ab805537a8e1679ad7b
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-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://vilenefex.ru/award?keyword=antropologia+social+pdf PDF link annotation
    • https://cdn.sqhk.co/tawakejolap/gfbWLia/95457390081.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/jhignif/remix_songs_2019_bollywood.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/eajcYKe/okay_madam_movie_kissasian.pdfIn PDF document text
    • http://vevaroda.scienceontheweb.net/31161596683.pdfIn PDF document text
    • http://pisufixefonof.scienceontheweb.net/amniotic_band_syndrome_adalah.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/haxHBI5/sivusufikuro.pdfIn PDF document text
    • http://jakiduve.scienceontheweb.net/52051135244.pdfIn PDF document text
    • https://cdn.sqhk.co/bezedono/oeQwNia/daxulojowobofax.pdfIn PDF document text
    • https://cdn.sqhk.co/fejovuwov/iejdCRK/free_printable_car_bingo_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/2wv7nRd/mobile_weather_radar_15.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/lGAhdfv/thumb_fighter_christmas_by_avix_games.pdfIn PDF document text
    • https://cdn.sqhk.co/fujikapoji/bLGjOEL/botaxoguwem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_1c93c6d5bc7f4734bec72d84c4620e73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/risc-_v_assembly_manual.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_2b27f1dafbc343ecbce2a97ee0b6ee89.pdf?index=trueIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/aprender_a_tocar_guitarra_acustica_muy_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/the_well_catherine_chanter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d65ce4-d20c-4cbb-a8f0-24f1fade7936/7646892783.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/wizorojepofogepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e436caef-d9b1-4e08-b8b6-c133d811d45c/all_trigonometric_formulas_for_class_12.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_5ff82aa02046482290dba1eeff663284.pdf?index=trueIn 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_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 5312 bytes
SHA-256: f344c96b0c0a8acc4251ad92bb50684b30933004139bdca1e669ba4ecdfac628
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 10312 bytes
SHA-256: fd1611b96857f2d9f5ed65e49dbb0c300a941caef9c3c3923c921693868be04a