Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b56550c052a6127…

MALICIOUS

PDF

182.8 KB Created: 2021-03-15 01:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f5b9ddf24f7b4647cb096ce566786f5 SHA-1: 950163da25ed72f271aceba934e943a53f9c132e SHA-256: 4b56550c052a6127e845ff69653b2ed209030df03f6e3cb327bacf03d618de27
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://seumenha.ru/wix?keyword=woodland+elementary+school+johnson+city+tn
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/puvodunefodeve_xamak_susexikazobux.pdf
    • https://powagaminabori.weebly.com/uploads/1/3/0/9/130969211/d0d604b65fed1dd.pdf
    • http://mitutepoka.medianewsonline.com/el_diario_de_greg_libros_similares.pdf
    • https://cdn.sqhk.co/sadisadaz/Hhc1Mgf/luwijujubejoxajogobuxej.pdf
    • http://osthondroz.com/zebubaxaruwibikitubejsc5d1.pdf
    • https://cdn.sqhk.co/pewesopefim/pqXhbja/farkle_score_sheet_free.pdf
    • http://powerpoint4you.ru/what_is_the_best_online_stock_trading_site_for_a_beginner_in_canada54su1.pdf
    • http://nubuxeki.scienceontheweb.net/78121543914.pdf
    • http://mylic.ru/vevotomazik99giu.pdf
    • http://bexemusu.mypressonline.com/83335485083.pdf
    • http://jovasetiveduza.scienceontheweb.net/87903196515.pdf
    • http://nasufulorejuwe.mywebcommunity.org/18019857791.pdf
    • http://pozufopajosel.mypressonline.com/bike_frame_design.pdf
    • http://xomerisupudegop.medianewsonline.com/25164385518.pdf
    • http://reduslimitalia.website/extract_annotationslhir1.pdf
    • http://jepisafidezegun.scienceontheweb.net/kvs_biodata_form_for_interview_tgt.pdf
    • http://wildber.store/26288850301pctxz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dukajevo/google_calendar_desktop_app.pdf
    • https://s3.amazonaws.com/gajabedafot/83976533219.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/40550567884.pdf
    • http://wiwosotu.myartsonline.com/how_do_i_change_my_honeywell_thermostat_to_celsius.pdf
    • https://s3.amazonaws.com/fajeloninesitel/99937131059.pdf
    • https://s3.amazonaws.com/purixifusipelid/mackie_1604-vlz3_16-channel_mixer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002877f.bin
57c650cc9716d6da935fbd261973cf1342b73708b0f0c1fc759e91eeb62323a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2877F 5160 bytes
font_01_sfnt_off000298ee.bin
f413bbcdd5a65be286ba961a73cc04ae038baf8d2aacf2b27fd9796afc4b5087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x298EE 11116 bytes
font_02_sfnt_off0002be32.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2BE32 4324 bytes

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