Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb27b1670a916fe…

MALICIOUS

PDF

127.9 KB Created: 2021-03-19 11:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d12ad5b6c297ee98bf8d9d7d1bc229a4 SHA-1: f0632c2cad69defd746539c0518148f081085b5a SHA-256: 1cb27b1670a916fe77e349e8e4bc4cd5114d517a2b64fe307b4b2ff118f90fc9
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. The document body, though heavily obfuscated, contains keywords related to free downloads, suggesting a lure. The presence of numerous external URIs, including suspicious domains like 'resalured.ru' and 'fresh-ita.fun', points towards the download of a secondary payload or redirection to malicious content. No scripts were extracted, but the PDF structure and external links are indicative of a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=biodata+for+marriage+in+marathi+pdf+free+download PDF link annotation
    • http://fresh-ita.fun/xabasogelefuwikab9qv4.pdfIn PDF document text
    • http://sisogelodaze.medianewsonline.com/79719673191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481162/normal_5fdf94d96206c.pdfIn PDF document text
    • http://dogoderusokita.iblogger.org/batman_cavaleiro_das_trevas_trilogia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5fff44b161b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_602b0bcf89af9.pdfIn PDF document text
    • http://nukuxarigikuxez.iblogger.org/seven_story_mountain_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_600f0a373efd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453144/normal_5ff1bc4f7fcbb.pdfIn PDF document text
    • http://vbruti.site/vuroruu1f27.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/wukabeguxafadabimapot.pdfIn PDF document text
    • http://uggi-ugg.com/30255307977uhu56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5ffcafd1ecc4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_602b2a0e60f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_5fe738257a6f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopigeberafa.epizy.com/awas_yojana_form_2020.pdfIn PDF document text
    • http://radodazemiluk.epizy.com/rotexule.pdfIn PDF document text
    • http://zitawajizotifam.epizy.com/asme_code_2020.pdfIn PDF document text
    • http://zizumanoxiv.epizy.com/lisd_school_schedule.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/13427082362.pdfIn PDF document text
    • http://repogadobuwiri.epizy.com/film_benyamin_sueb_biang_kerok.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C253 5420 bytes
SHA-256: 853bf5c1e2bbdfebd626bd5d493240c9fc0d9fdcf15e4b1d339ed385f8abc256
font_01_sfnt_off0001d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4AE 8516 bytes
SHA-256: 5172db80b009f8008818e1caa844fbcd4339d1658eac6cecd273ee4d480dcf41

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