Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d3ddcbd4b12ce4…

MALICIOUS

PDF

85.9 KB Created: 2021-03-30 12:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 60a60db38b8fad99f72c0ff19f7703a6 SHA-1: 765961e5971067484db9ba5ef40c70e5e0d7a85e SHA-256: 77d3ddcbd4b12ce4ece3911f4b607316a3cef4f37c5490d2d58f6ccb63597a5e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jacksth.ru/aws?utm_term=does+kenmore+ultra+wash+dishwasher+have+a+filter PDF link annotation
    • https://cdn.sqhk.co/viwukepato/ejPhggm/robironizijateb.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/ibibU6i/bebas_condensed_font_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dogojaseziwo/o74l1oB/69534556036.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/cTzgjha/warhammer_adventures_skaven.pdfIn PDF document text
    • http://semengergel.ru/what_is_the_tree_of_life_bible_version4gxnq.pdfIn PDF document text
    • http://all-system7.xyz/8_ball_pool_hack_no_human_verificatio239b.pdfIn PDF document text
    • http://onlinetiser.website/excel_financial_spreadsheets_templates_free9faq1.pdfIn PDF document text
    • https://cdn.sqhk.co/bomagomax/jeohfij/best_note_taking_apps_for_surface_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/gh7VxOC/65151861287.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/how_to_change_time_on_avaya_1408_phone_systemve5zd.pdfIn PDF document text
    • http://xizapataruxeku.mygamesonline.org/html_font_color_codes_list.pdfIn PDF document text
    • http://pixxel.life/perimeter_worksheets_freent9jf.pdfIn PDF document text
    • http://espaceclient-cmb.com/the_sims_4_product_codesy1qhn.pdfIn PDF document text
    • http://jelusuvobirolen.mywebcommunity.org/durham_bulls_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/kinerufi/dRhdijF/glow_monsters_maze_survival_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/aicxVhj/94747961471.pdfIn PDF document text
    • http://starkrobotics.org/json_formatting_c_newtonsoftk23xl.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jcFYhag/idle_tap_airport_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/ZiciaYM/57732929720.pdfIn PDF document text
    • http://shtangye.xyz/21709533050a4jr0.pdfIn PDF document text
    • http://dfds.in/woocommerce_social_login_wordpress_plugin_free_download65blc.pdfIn PDF document text
    • http://tertov.xyz/43988671517afkc9.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
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_58881462f4a440d69c25fe4a8c38a66a.pdf?index=trueIn PDF document text
    • http://gegurobaz.myartsonline.com/chemistry_lab_apparatus_images.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_ec3f7ed614f8411eb569eb097afef276.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_3508380f0dc64aa6b043db0d8cdebe23.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_542be8753a904b998a96dc98d7d823d2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 5244 bytes
SHA-256: bdbebff8a9c4db0c43706ed022ae0e1a1bd6d6d62c87582c58d562a9e1f0bf7e
font_01_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 10744 bytes
SHA-256: 0a88865c47d080787dea9e0778f5037916c513e53457c35f9174713c0a06ee9e
font_02_sfnt_off00013b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B20 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361