Malicious PDF — malware analysis report

Static analysis result for SHA-256 5112966be216f314…

MALICIOUS

PDF

91.0 KB Created: 2021-03-29 05:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d4f8df66d5185f53caf8f5c58abe9165 SHA-1: 5b463d39f53bf5082de9fb500877a07731dbbf2b SHA-256: 5112966be216f31471d1f88e64bf618712b7562c2b7c1ad018e9522dd79c4ea3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'Cupones burger king' and 'wkhtmltopdf', implying a deceptive pretext to drive users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=cupones+burger+king+octubre+2020+pdf PDF link annotation
    • http://sikevemekoma.mypressonline.com/sports_clothes_vocabulary.pdfIn PDF document text
    • http://helplnstagram-confirm.com/vomisoxunvpmuz.pdfIn PDF document text
    • http://deliwubavamir.mypressonline.com/curriculum_vitae_en_anglais.pdfIn PDF document text
    • http://rimka.xyz/jmi_b_tech_2018_application_form84skj.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/72202054506.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/how_to_get_employment_insurance_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/hjegigi/puritan_bennett_840_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/hjchbia/tukawazewiku.pdfIn PDF document text
    • http://wekeb.space/302118949243zyb7.pdfIn PDF document text
    • http://palawawez.mypressonline.com/47511774136.pdfIn PDF document text
    • http://wonder-ita.fun/8472375104945guj.pdfIn PDF document text
    • http://nonly.xyz/marisuwobetozejuterugewarc3cnd.pdfIn PDF document text
    • http://smm-target.ru/you_are_not_so_smartjm2jz.pdfIn PDF document text
    • http://gujozulogisin.scienceontheweb.net/upsc_assistant_commandant_2020_notification.pdfIn PDF document text
    • http://zesamoa.online/mushoku_tensei_wikia_eriswx0v2.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/xunafununijinugevuvef.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/seismic_wave_theory.pdfIn PDF document text
    • http://gbo.guru/818436072036xr9e.pdfIn PDF document text
    • http://technodom11.com/letra_y_acordes_de_la_cancion_abre_las_puertas_del_cielo_acordesk9x9d.pdfIn PDF document text
    • http://meetly.space/bacteriological_analytical_manual_aerobic_plate_countprsex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taberadajip.atwebpages.com/washington_gas_credit_union_login.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 5464 bytes
SHA-256: 8bb5cf40ae58789d4e12a3f1129a4083467e36a3b16c27f84b5aeb0c2b4dc860
font_02_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 3252 bytes
SHA-256: 657b9960af79c9672c76e3ac81cd5ed46916f8e185cdf91abcd1e3a9e8b8285c
font_03_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 12644 bytes
SHA-256: 2173ba9f3b26ed1afff1db6721f7c135cc936bcd871a8ff09f813e701c341ba3
font_04_sfnt_off00014652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14652 16292 bytes
SHA-256: 5b467e05cb649e85fe0c19e84d23bc4bd96c0cad2c44f0fb8d26367c3aa3d96c