Malicious PDF — malware analysis report

Static analysis result for SHA-256 a955967161bfc976…

MALICIOUS

PDF

82.8 KB Created: 2021-03-23 10:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50ce3b6fa6b9a14e1617304a834df1d5 SHA-1: 7be39dccf15544854b087077cdf95abf2decd32b SHA-256: a955967161bfc976a911a981126f63a4cc3958e823a73335a275324be7d86cf8
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and numerous embedded URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of multiple external links, including one pointing to 'kuzutuzo.ru', indicates a likely attempt to redirect users to malicious sites or download further payloads.

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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/wix?keyword=topik+guide+grammar
    • https://cdn.sqhk.co/runenuti/bijibLT/common_octopus_lifespan_atlantic.pdf
    • https://cdn.sqhk.co/sepexapubu/GpiflU1/tawafunozuvaw.pdf
    • https://cdn.sqhk.co/vetukalujir/rggtn7x/81103522826.pdf
    • http://vegofejolafud.mygamesonline.org/71755721624.pdf
    • https://cdn.sqhk.co/zogobadakedu/jAmjfgd/the_chosen_one_netflix_season_2.pdf
    • https://cdn.sqhk.co/rujiwujik/gdiekvW/qr_code_scanner_download.pdf
    • https://cdn.sqhk.co/wevavagu/jjd99I8/vintage_arcade_games_for_sale_near_me.pdf
    • https://cdn.sqhk.co/zokuwagopole/jdveJEd/93827055909.pdf
    • http://worozoxiw.sportsontheweb.net/admiravel_mundo_novo_online.pdf
    • https://cdn.sqhk.co/juzurupivepo/tjhjcgg/midumekoloxiw.pdf
    • https://cdn.sqhk.co/bodapumof/ghhd7mJ/46422056146.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_f79201aa10054664b50c30e35c65e80e.pdf?index=true
    • https://s3.amazonaws.com/vavapekadoliti/miguel_adorn_music.pdf
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_e46ca53d055043f1be499e05bee0c760.pdf?index=true
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_34e1be2c9a1f4febb12b9e7d98c4d045.pdf?index=true
    • http://sajatuvireguta.atwebpages.com/introduction_to_theoretical_aerodynamics_and_hydrodynamics.pdf
    • https://s3.amazonaws.com/tibitexil/how_to_cook_a_turkey_in_the_big_easy_oil_less_fryer.pdf
    • http://dogiwexor.myartsonline.com/xenedivujiziwodanananam.pdf
    • https://uploads.strikinglycdn.com/files/bc9ca789-a751-4852-9afd-eaaf74ea8d2e/94923878614.pdf
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_134c431342424cf99e4f3644c3bd9a6f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a0f888f0-9804-4534-bc63-e4ab632cbdd5/taxogolatavor.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_off0000eeae.bin
ac653318f796bafa707d9d9f4d86bbdc9f3f7cd470fa3597498ccfc238d21f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 6832 bytes
font_01_sfnt_off00010570.bin
1eca30b8bdfe04da5452b7b044c84edede565d5469257105fa736550ea9f51f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 5080 bytes
font_02_sfnt_off000116a7.bin
1e58202fa6d6d35ae5f64aa640406f3f07332f9d241718027e715b4188997b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 11388 bytes

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