Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a975a69d1d22177…

MALICIOUS

PDF

74.4 KB Created: 2021-04-02 16:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6885c5f39fdd64f94768760790d93b7a SHA-1: 42b4914d9c8b8c2690323afc3561b1ae1f9e3764 SHA-256: 5a975a69d1d22177f936027f2933326876630e0f6f123692c2f4073404c9ce09
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, and contains numerous external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt disguised as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/award?keyword=english+grammar+lessons+book+pdf PDF link annotation
    • http://rewita.fun/96808256191drv3n.pdfIn PDF document text
    • http://meetsoda.pro/how_to_read_ebook_on_amazon_fire151c2.pdfIn PDF document text
    • http://vazitafolozif.22web.org/fuvumegaretajal.pdfIn PDF document text
    • http://latejugo.22web.org/kojodawite.pdfIn PDF document text
    • http://momsmall.space/rigerituxunofamifurufunm21b.pdfIn PDF document text
    • http://rixanemusijod.mywebcommunity.org/java_core_concepts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/investing_in_shares_for_beginners_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/horus_heresy_board_game_miniatures.pdfIn PDF document text
    • http://wewadem.epizy.com/kdoqi_guidelines_calcium.pdfIn PDF document text
    • http://jopinewo.epizy.com/du_monde_entier_blaise_cendrars.pdfIn PDF document text
    • http://lekazukexofa.rf.gd/polyurethanes_coatings_adhesives_and_sealants.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/mozogonibovawelonij.pdfIn PDF document text
    • http://pipomutazujem.rf.gd/what_to_eat_vegetarian_to_lose_weight.pdfIn PDF document text
    • http://kikukuvikato.myartsonline.com/fusionner_deux_document_en_ligne.pdfIn PDF document text
    • http://didoruvevesipug.rf.gd/bendable_concrete_project_report.pdfIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/zeguwafimezo.pdfIn PDF document text
    • http://womefobusefox.rf.gd/98680570749.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_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 5616 bytes
SHA-256: 1c73fb8484e5cf4c196fc52c1e8f5ecdd764479df962c21c7d1ba67412ae79de
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 10524 bytes
SHA-256: 205ef594b56abd28d1dcb49fbdc23c6accbddb73aeb518957941ff785a30e22c

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