Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68949581e7f9122…

MALICIOUS

PDF

76.1 KB Created: 2021-04-12 18:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ce9738451254d7519b19a0c1116ba347 SHA-1: 24c7e0436a7df19dbd9b9e2423f76ddb38236195 SHA-256: a68949581e7f91224c4703c449157e4f043e73a7e8b81f6038118868ee095f64
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URIs, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed to redirect users to potentially malicious sites. While no scripts were directly extracted, the nature of the embedded links and the heuristic firings suggest an attempt to lead users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://leonvi.ru/strik?utm_term=nikko+stirling+gameking+3.5-10x44 PDF link annotation
    • http://maporirunigis.22web.org/company_of_heroes_2_best_tank.pdfIn PDF document text
    • http://esagafow.fun/zulatogiwemekosavosaikvdh.pdfIn PDF document text
    • http://xujaxul.mywebcommunity.org/cfa_level_1_books.pdfIn PDF document text
    • http://pivowave.iblogger.org/90666758514.pdfIn PDF document text
    • http://ledamujokada.22web.org/how_to_get_star_citizen_for_free.pdfIn PDF document text
    • http://subfamjtii.site/gatizesik43y8m.pdfIn PDF document text
    • http://copyrighthelpcentral.com/26401487307exqdr.pdfIn PDF document text
    • http://diganez.iblogger.org/jenusul.pdfIn PDF document text
    • http://blog-millionaire.buzz/acute_myeloid_leukemia_diagnosissqefo.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/feudal_japan_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futebowa.atwebpages.com/amino_acids_table.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_32dd501e93c24275abd261f5fc34d1a9.pdf?index=trueIn PDF document text
    • http://lupipabibokaf.rf.gd/free_fire_pc_version_free.pdfIn PDF document text
    • http://newiroxupamorik.rf.gd/free_border_word_template_design.pdfIn PDF document text
    • http://xojorefalez.rf.gd/60338809450.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/duxirijalenor.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/what_is_meant_by_canon_law.pdfIn PDF document text
    • http://lavapokapajemob.myartsonline.com/38686397635.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/here_comes_the_sun_ukulele_chords_beginner.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_60dada5faba942b09519a09e66c97449.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_06eab39ba02943a1a6389c812b3b74f7.pdf?index=trueIn PDF document text
    • http://zabirozoxut.epizy.com/albertus_mt_bold_font_free.pdfIn PDF document text
    • http://wesokukukidi.epizy.com/30773068581.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/32240600232.pdfIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_fe95968726d74826b1292ac8eb066a79.pdf?index=trueIn PDF document text
    • http://zapuwoz.epizy.com/ocean_12_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/leadership_job_interview_questions_and_answers.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_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 5740 bytes
SHA-256: 3c6dd56d5e03063b82cd132b7f5fdc7fc19f115acf4042b66669f6d65925ea94
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10520 bytes
SHA-256: e5114ecc2c3155720a5b5563972cbf5a592feab4ed3522e2aa2294692bd6bfde