Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a3364846b82f19…

MALICIOUS

PDF

83.7 KB Created: 2021-05-17 08:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15daa708d69bdc984e6fe835083d4cc1 SHA-1: eccde75754b19d8c5e409677f18d201d2bb0ea8a SHA-256: d8a3364846b82f19d0765a485a3f152b68f4f3014aad4ba6088ed99f9c08a1d3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'xezojetit.ru', which is likely a malicious domain used to host phishing content or distribute further malware. The PDF also acts as a link farm, with multiple embedded URLs, some hosted on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://xezojetit.ru/wb?keyword=los%207%20habitos%20de%20la%20gente%20altamente%20efectiva%20ensayo%20critico
    • http://mimisijuz.mypressonline.com/dabowabevamolera.pdf
    • http://50off.pro/sepafiud00z.pdf
    • http://upgrade4me.com/denodosamosofexojotudc8gu.pdf
    • http://monoga.space/notification_sounds_app_iphoneesi31.pdf
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/liraliro_gagipelukaxewi_sepizolude_pisorabu.pdf
    • https://kigijizinelojuk.weebly.com/uploads/1/3/4/8/134848952/2567b3dea0f.pdf
    • http://pixunune.sportsontheweb.net/sex_education_season_3_release_date_countdown.pdf
    • http://film123watch.com/27136267255a4b0s.pdf
    • https://kakabotosor.weebly.com/uploads/1/3/0/7/130775724/773f451bbb012e8.pdf
    • http://hookup754.fun/lifetime_basketball_hoop_walmart_assemblyxh653.pdf
    • http://mubositesene.mypressonline.com/89172787971.pdf
    • http://lynciguest.com/petofatunuwabavi5h7gg.pdf
    • http://twirlini.com/zoom_h4n_pro_4-input_4-track_portable_handy_recorder_with_onboard_x_y_mic_capsule_blackvh6e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f4602f40-b922-461f-b00f-61b4c442b434/how_to_make_a_easy_puppet_show.pdf
    • https://uploads.strikinglycdn.com/files/554aaa98-f267-4506-9446-f4cb26447eb4/every_living_thing_dies.pdf
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_37267dd46fb34d4290624e57eec1e909.pdf?index=true
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_cfe9f1f5fdef4affa6dc806e812429a1.pdf?index=true
    • http://mekasesajiw.onlinewebshop.net/in_the_afterlight_book.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_off00010633.bin
528be91255bc847a44f22531c3c062db911392a504c33db9060a54996ebe5eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 5760 bytes
font_01_sfnt_off000119ba.bin
f086516fab66698b378b5be6e4c2763f51eb6e99d6fe0ce48e92ef8564e41b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 11600 bytes

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