Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2318d29a0e3b34a…

MALICIOUS

PDF

86.3 KB Created: 2021-04-07 08:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddc6859ba8aad9b34bf39d4e862ecfba SHA-1: 7b2865fe1afbcf893d937a86a8d0c99526ac09bd SHA-256: f2318d29a0e3b34a1c828d6942a6bb42e8c349632586ec6ba8d94134680ec096
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or lead to phishing sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

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
  • 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://xajibur.ru/wix?keyword=descargar+musica+gratis+app
    • http://zokidinodajives.getenjoyment.net/o_autismo_livros.pdf
    • https://cdn.sqhk.co/mugegiduveb/UqRlgiq/riot_war_highway_mod_apk.pdf
    • http://bimonetejatoleb.mygamesonline.org/litatafesenasixomuwiru.pdf
    • http://gilumesu.mypressonline.com/how_to_redeem_v_bucks_code_on_switch.pdf
    • https://cdn-cms.f-static.net/uploads/4426409/normal_5fd16e9248b5d.pdf
    • https://cdn.sqhk.co/sidamebo/i3iczgh/wind_hero_apk_home.pdf
    • https://cdn.sqhk.co/bikuloxisage/emhhjcn/unchained_melody_sheet_music_with_lyrics.pdf
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/45b17f724c.pdf
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/nisagogi.pdf
    • https://cdn.sqhk.co/pitadewedobu/JEghnih/dixedubafota.pdf
    • http://gejesixave.scienceontheweb.net/telemetry_systems_engineering.pdf
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/zorojatuki.pdf
    • https://cdn.sqhk.co/noneniwetav/TAigN6r/doctor_on_demand_mn.pdf
    • https://zokuvulasaxibu.weebly.com/uploads/1/3/5/2/135298812/1896337.pdf
    • https://cdn-cms.f-static.net/uploads/4451971/normal_6027b86c4b5a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_ff81a11218b44e44a1f188d565f2ad11.pdf?index=true
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_1c0930e882d24975be805bf98ed9f0f8.pdf?index=true
    • http://ginowane.onlinewebshop.net/gixupotoworawozoditawemo.pdf
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_a2157c44e3804943b505da82577b04c3.pdf?index=true
    • http://pakatikik.epizy.com/maxapizumimoxisozilib.pdf
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_d7a2a3f82ec248d0a4aa6b8678eb97d4.pdf?index=true
    • http://xonefepuvimami.epizy.com/803567023.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_off00010fa6.bin
7a512b6baaa002b4058fcec381e88a863f484271ff946cfb9ef325b8d6be6a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 5220 bytes
font_01_sfnt_off0001215f.bin
904e02030c65aedd6ac99aa3551ccb730cbec47fcfc15ee8d616a2f002aa4119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 12648 bytes

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