Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c9e4c5cc6faffd…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 12:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b0c102b96178d9f2ccf1e5e9d648ec8 SHA-1: d4643b708b55129c5aa62cd84b7baa386afd545b SHA-256: 99c9e4c5cc6faffdd62762ca9fc80173e0ee5abb580ef186934ee129c534b329
164 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which appear to be generated for SEO purposes, creating a link farm. The document also contains urgency language, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=what+does+ec+mean+on+a+hot+tub
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/6de8dffa.pdf
    • https://cdn.sqhk.co/gebitasixa/xjfjDhh/car_games_play_games_online.pdf
    • https://cdn.sqhk.co/tajavujexiz/ijiC8jc/livewadedifumuw.pdf
    • https://vujexuxifu.weebly.com/uploads/1/3/0/7/130739824/sadanavosupinudidawe.pdf
    • https://roxejozojone.weebly.com/uploads/1/3/0/9/130969259/tajojudafu-finovufilugafim-rutorebi-tojemuvewex.pdf
    • http://rotirir.mypressonline.com/36995970929.pdf
    • http://gokojun.scienceontheweb.net/anxiety_orthomolecular_diagnosis_and_treatment.pdf
    • https://tetafawewaze.weebly.com/uploads/1/3/4/3/134378669/1838607.pdf
    • https://cdn.sqhk.co/zowolanazew/hiS3lgf/superbike_drag_race_tesla_f1_car_fighter_jet.pdf
    • http://fijazubelanulek.mywebcommunity.org/96596740513.pdf
    • https://fijoxivivuf.weebly.com/uploads/1/3/4/0/134041864/4199603.pdf
    • http://toworugesolur.getenjoyment.net/kasasugexuvenotutinadax.pdf
    • https://cdn.sqhk.co/zidexamuwela/jgcjfie/44609410912.pdf
    • http://dle-tpl.site/25968132098yx9kh.pdf
    • https://cdn.sqhk.co/wuzosiboweja/ddRheei/pixel_s_unknown_battle_ground_mod_menu_apk.pdf
    • https://cdn.sqhk.co/dutebosatu/KBje47t/top_10_gospel_songs_in_nigeria_2020.pdf
    • https://cdn.sqhk.co/salavogi/px5ig2r/us_army_after_action_report_format.pdf
    • http://tricitysikhs.com/672375280411yh2i.pdf
    • http://pasendapp.online/lockpicking_guide_tbca9cc6.pdf
    • https://cdn.sqhk.co/jojojidatun/hhuibhh/4fun_tv_dance_co_bylo_grane.pdf
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/dc933da2d38f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pikaderobiw.atwebpages.com/lista_calciatori_fantacalcio_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f430.bin
591f16efd06af39d5933d2ef45040982717120dc4bc7b1e3cc09a02c13b68376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 5204 bytes
font_01_sfnt_off000105c9.bin
c84c89d1b0298b7b5bd5ea3c8f0af251b1302f4f7bfb68e0ccb282f043783266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 11096 bytes

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