Malicious PDF — malware analysis report

Static analysis result for SHA-256 27030ebe0fea7596…

MALICIOUS

PDF

99.9 KB Created: 2021-03-18 13:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1fb312814d40cf480001177d7af8a6d1 SHA-1: ef0a964c2c5b8cf2151bc4b95109123a3470ed37 SHA-256: 27030ebe0fea7596ed99005e83a34c60a686339c1abb6ca0e2d66dce2bad9e37
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, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://xezojetit.ru/award?keyword=acca+f9+kaplan+exam+kit+pdf', suggest a phishing or scam attempt disguised as an exam kit. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=acca+f9+kaplan+exam+kit+pdf PDF link annotation
    • http://wiwikiru.iblogger.org/why_is_my_dishwasher_not_cleaning_glasses.pdfIn PDF document text
    • http://xonuberan.22web.org/11319037205.pdfIn PDF document text
    • http://rivuxini.66ghz.com/89181705821.pdfIn PDF document text
    • http://volomowoxe.22web.org/74573096616.pdfIn PDF document text
    • http://vizemezezu.sportsontheweb.net/world_history_book_for_upsc.pdfIn PDF document text
    • http://bibajif.22web.org/lamudunararuragiwitamij.pdfIn PDF document text
    • http://wonizojaru.scienceontheweb.net/vutinademudawotogizur.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokivifox.epizy.com/manozozuzufavo.pdfIn PDF document text
    • http://gisatazab.rf.gd/fupozadabuxujeragul.pdfIn PDF document text
    • http://pijularof.epizy.com/email_signature_template_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/zodubaregobizuva.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/pidovifiwive.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_2c9fb15053bd41cb9a53df3f3949eae2.pdf?index=trueIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/ejercicios_nacionalidades_en_frances.pdfIn PDF document text
    • http://tosipasakuvil.myartsonline.com/hypoglycemic_encephalopathy.pdfIn PDF document text
    • http://lizibafolajoril.epizy.com/xinunukizag.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/zolov.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_9b53bf65e1e54c2a96c8f3691cb29d6c.pdf?index=trueIn PDF document text
    • http://fisejotigu.epizy.com/tubugozarole.pdfIn PDF document text
    • http://gamukudolaxe.epizy.com/keruxagadodopodajuzubafo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B28 1604 bytes
SHA-256: d61375622b9e918e10bac100a1eb342a84b314fc0131c434b35f2bc17295445f
font_01_sfnt_off00013325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 5304 bytes
SHA-256: 94333d74d1c350f65da12aba86f89d866c6cd80c836849fc5c1453dd1e4cf558
font_02_sfnt_off00014536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14536 11664 bytes
SHA-256: 50f38bfdc52d52bff89777231f5edc2329a762ea466eb715d1eea5ca734f75d0
font_03_sfnt_off00016cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF3 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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