Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7e4e364eb9611a…

MALICIOUS

PDF

90.2 KB Created: 2021-04-07 09:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1f8f83eb1e4fae8e6f8ead615b26006c SHA-1: 5c9ca1ca14639eacfefe8ce3dcc0aebd4a8f7ee7 SHA-256: aa7e4e364eb9611a4405ace46b4aa068bb41c84e218483e0b181d26e6ec3aa3b
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 0.9955

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://jacksth.ru/strik?utm_term=como+aceptar+una+oferta+de+trabajo+por+email+ejemplo PDF link annotation
    • https://cdn.sqhk.co/marunenoxak/jGVhhEk/crystal_puzzle_3d_apple.pdfIn PDF document text
    • https://jepukarebav.weebly.com/uploads/1/3/5/3/135321711/202af69d.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/sjhidhc/gun_strike_counter_terrorist_3d_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/fji6dOC/yellow_soles_of_feet_baby.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/8287785.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/gigK4gf/rally_championship_1996.pdfIn PDF document text
    • https://cdn.sqhk.co/japuwejede/gcUs7Ei/dca_online_form_last_date.pdfIn PDF document text
    • https://tomumexajozovod.weebly.com/uploads/1/3/0/9/130969356/munerufigonunupupope.pdfIn PDF document text
    • https://cdn.sqhk.co/teganipuputu/giha4OP/khloe_kardashian_age_net_worth.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/21729992566.pdfIn PDF document text
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/bakuxerusagadu.pdfIn PDF document text
    • https://cdn.sqhk.co/birugafomafo/gghhiji/zig_zag_part_2_braids.pdfIn PDF document text
    • http://pasagotijaweti.iblogger.org/kerakoll_biogel_no_limits_datasheet.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/9fecad4d2.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/ncert_12_biology_book_download_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wafepazi/jagd9jH/53200108913.pdfIn PDF document text
    • http://kegumexiwekot.22web.org/23864617880.pdfIn PDF document text
    • http://vanufitil.22web.org/eccentric_exercises_for_patellar_tendonitis.pdfIn PDF document text
    • https://negofajosodin.weebly.com/uploads/1/3/5/3/135314147/d986e411986ab8.pdfIn PDF document text
    • https://kololopobiro.weebly.com/uploads/1/3/4/8/134853362/zipomomogawugu-tuxew.pdfIn PDF document text
    • https://poxanopa.weebly.com/uploads/1/3/4/3/134380657/zarija-pevile-bimuvipulagu.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://fazafowunop.epizy.com/41116894429.pdfIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/pirates_of_the_caribbean_piano_duet_sheet_music.pdfIn PDF document text
    • http://vojevawe.epizy.com/marketing_management_ebook.pdfIn PDF document text
    • http://xiwexuxe.atwebpages.com/geometria_analitica_vectorial_figueroa.pdfIn PDF document text
    • http://suwuriru.onlinewebshop.net/is_wordpress_the_best_website_builder.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_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 5244 bytes
SHA-256: 8333fe1f3a8fde0c1873b2d22d8e12643028a4f64d42097ae61027d6fc4c8f2c
font_01_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 12284 bytes
SHA-256: 211723cc46b409a53b4aec92010de37b9f236e034fa758276853c998f3d1fa57
font_02_sfnt_off00014aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2