Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b3b7a97f2bbe5c…

MALICIOUS

PDF

79.4 KB Created: 2021-03-24 23:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e351ddd663939e6b3c9d30205b52b740 SHA-1: bba9db902613908ffcd71b54c4b9e2e857c78716 SHA-256: 58b3b7a97f2bbe5cbcee6e3b719ad71c5f669f0904f8ef420b44906548172ad1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/wix?keyword=transversal+angles+worksheet+middle+school+pdf
    • https://cdn.sqhk.co/foluxaziwaj/sY1ghhd/car_game_apk_file_free.pdf
    • http://tuwasukam.getenjoyment.net/jujul.pdf
    • https://bivupexas.weebly.com/uploads/1/3/1/4/131453521/4755789.pdf
    • http://botodowur.iblogger.org/90659795547.pdf
    • http://xoxuvajes.mywebcommunity.org/nujogajop.pdf
    • http://wulutano.mywebcommunity.org/how_to_winterize_a_simpson_power_washer.pdf
    • http://xapidomin.mywebcommunity.org/56267893451.pdf
    • https://xibokesobapud.weebly.com/uploads/1/3/0/7/130776239/xuwigemelonikodezem.pdf
    • http://vekisonoloze.sportsontheweb.net/zisijosujomosupuboga.pdf
    • https://cdn.sqhk.co/nebuwaxisiw/4hggKia/gold_glitter_wallpaper_for_walls.pdf
    • http://duwosolutanuz.mypressonline.com/49660641103.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://refazak.epizy.com/toastmaster_table_topics_evaluator_script.pdf
    • https://s3.amazonaws.com/xesigeze/radiation_therapy_ppt_template.pdf
    • https://s3.amazonaws.com/kujapomib/cules_son_los_tipos_de_cuentas_bancarias.pdf
    • http://vupaguriwedizid.atwebpages.com/rasomoxusebofuderezera.pdf
    • http://sovogezo.atwebpages.com/ac_sweep_pspice.pdf
    • http://remekos.rf.gd/sennheiser_rs120_ii_wireless_over-ear.pdf
    • http://sidiwen.epizy.com/wedding_budget_checklist_uk.pdf
    • https://s3.amazonaws.com/fekazudabo/calendario_civico_escolar_2018_peru.pdf
    • http://dexifuv.epizy.com/postgres_clustered_index_performance.pdf
    • https://s3.amazonaws.com/fotepopunaj/atomic_habits_free.pdf
    • https://s3.amazonaws.com/daxemo/pusax.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ce.bin
1a32761befbe897820cf79792b69442bf79a7ce102318dbb7a6b4389436b6a90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 5736 bytes
font_01_sfnt_off0000f437.bin
86ccf5b0c2a4f9f465eaad10ea525187562458855201865180e04cc919825222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 11216 bytes
font_02_sfnt_off00011aba.bin
24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 16072 bytes

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