Malicious PDF — malware analysis report

Static analysis result for SHA-256 4823b1ce74791058…

MALICIOUS

PDF

83.1 KB Created: 2021-03-09 01:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fdeeb7279c310ed78885a55f6fe8a5e6 SHA-1: 8f0eeb78585e5385f6195215a2fad0e9202cb249 SHA-256: 4823b1ce74791058c9255b4495f933b9f045c3352d92c884af8ff73fd7445a91
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to obscure the ultimate download destination. One prominent URL, 'https://kuzutuzo.ru/123?utm_term=meme+generator+pro+mod+apk', appears to be a lure for potentially unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/123?utm_term=meme+generator+pro+mod+apk PDF link annotation
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/6457600.pdfIn PDF document text
    • https://kalizijowu.weebly.com/uploads/1/3/4/7/134733304/8014935.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/the_10-day_detox_diet_autoimmune_solution.pdfIn PDF document text
    • https://gipasutojemozup.weebly.com/uploads/1/3/1/3/131379868/gufetetasasawenujada.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/what_does_pop_culture_mean_today.pdfIn PDF document text
    • https://demogevofowa.weebly.com/uploads/1/3/4/6/134608938/takegasajat.pdfIn PDF document text
    • https://rupilobeva.weebly.com/uploads/1/3/0/7/130775598/nimurasikokawul.pdfIn PDF document text
    • https://tedatigajixa.weebly.com/uploads/1/3/0/7/130739480/xeribawap-selaguje.pdfIn PDF document text
    • https://tovumanaxi.weebly.com/uploads/1/3/5/3/135392352/worarufiselexujiwo.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/dymo_letratag_label_maker_ink_refill.pdfIn PDF document text
    • https://mixifomako.weebly.com/uploads/1/3/1/1/131164472/d5e93a3d17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/74211fdc-dd64-40e7-b16d-dd6159ca9412/hp_laserjet_1012_driver_mac_catalina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971d6983-f7a9-437c-833b-2db67f45d489/ham_oven_temp.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/camtasia_studio_8_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78e37a7-40d7-4cfb-b8dc-f4c7bac58ae0/sutapibevepa.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/orchestrating_winning_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae2bde3-4e45-41ef-a085-1c14f1631684/technics_sl_d20_direct_drive_automatic_turntable_system.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/kemupaxukubujudi.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/86803190158.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/82149043812.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 4880 bytes
SHA-256: be9eb0d51c5c6b643378d295757cef3c7f01d0f6be44c995ab50d7abdaf3c6bb
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10652 bytes
SHA-256: 9a647fdf110d27be92e09f766851c1afb6d8344d6228003b25996f8caa15ee14
font_02_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61
font_03_sfnt_off000130f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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