Malicious PDF — malware analysis report

Static analysis result for SHA-256 2915ed4ec36da707…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 12:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dec122a1ce65ceb22bee0c99094cd3f8 SHA-1: 99a2de62c4653ba77ed127795b04695fe9b37925 SHA-256: 2915ed4ec36da707e3b136dc7a019385982068c3aad66500ffe50716fa5b8f17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=gta+5+phone+cheats+motorcycle PDF link annotation
    • http://duetsepolno.pl/userfiles/file/56746937971.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/rikabodatukiroku.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/50139347804.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/satodawovoreti.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea639db87f---getiwakuboze.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/darilenesamedekesidajor.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/tobaxajujerojasud.pdfIn PDF document text
    • http://pjteam.hu/uploads/55423265836.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/rugurazasejozekave.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/jatatimu.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/c3ITUayvC90K.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/pedekinerixamatakazi.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/burinarunajegoguvuna.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/52552866328.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109121322225326.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/mezafojipuwidipixesunega.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/74934980622.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/16286615386.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6da092693---pufowifiriruba.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xowetamovuzejusokobikam.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/4628111615.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/rusetu.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/lesuxefesesatedesi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 18856 bytes
SHA-256: 1892b99a8354ca098c73a2c73a880e768e2ec111bce612924bcc6954ed37617c
font_01_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 10832 bytes
SHA-256: fab403e95beb4742307f5887ce39befcb99fa6f08de2424b5e802c0a4a17361b