Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef7eff42159c7dd…

MALICIOUS

PDF

77.0 KB Created: 2021-02-23 16:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 74b75ffcf7875e4771f36dfc863d0c48 SHA-1: 93f18c06c743dad48a323db37316c5aacee94022 SHA-256: 6ef7eff42159c7ddb062de305e81e9fba4b2e1b404ab648c20251d4cb042d3ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/wix?keyword=kambi+kathakal+pdf+drive PDF link annotation
    • https://cdn.sqhk.co/dagufiwus/hhehgXr/jatoxumiwivisuwibedet.pdfIn PDF document text
    • https://cdn.sqhk.co/fotezuvori/irSfib3/war_of_colony_tower_defense_strategy_game.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/siwop_jokusixagit_pubuzi_dugarumegazezi.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/hfm54mh/increase_followers_on_instagram_app_download.pdfIn PDF document text
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/1f804ba.pdfIn PDF document text
    • http://pemojubeku.iblogger.org/carpenters_close_to_you_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/gjggI8P/bijitobidemorezu.pdfIn PDF document text
    • https://cdn.sqhk.co/tirewugodus/jcQjcih/best_heroes_genshin_impact.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/5Ho3Wjc/robemeromo.pdfIn PDF document text
    • https://tiseworadew.weebly.com/uploads/1/3/5/3/135317060/2295617.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/JjjTkyq/arijit_singh_songs_instrumental_ringtone_free_download.pdfIn PDF document text
    • https://vowevabejera.weebly.com/uploads/1/3/0/7/130775986/7ccd8c7a05ac.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/fSigngc/cannon_sound_effect_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/heg8Agc/mod_pizza_coupon_valpak.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/jDwigig/60700662847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dagasopones/biochips_ppt_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/76142133196.pdfIn PDF document text
    • http://bixodog.rf.gd/d_c_full_form_in_police.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/wesebepilezepawaz.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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 5336 bytes
SHA-256: c1bd7cbe662268688197508ca3f4aeb6dcc7496f65259355d75363b0bf69085d
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 14860 bytes
SHA-256: cc42c95e08e17ec0d5bf5cb6b0313b545ba4269df36c543781ec089fb89cc2ef

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