Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3e301995ed2ebe…

MALICIOUS

PDF

89.8 KB Created: 2021-03-20 23:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 45e2895afc3c58b7fe3fd4a6b312cebb SHA-1: 2629776c583b9d1e34a0f9cc68c43a3a17f5885a SHA-256: cb3e301995ed2ebe3606f8e940bd330cbef507b40b4cf4f2e2d450f0bb557793
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to contain text related to academic subjects, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=a+level+biology+syllabus+2019+edexcel PDF link annotation
    • http://zukoretevir.medianewsonline.com/kapasabejani.pdfIn PDF document text
    • http://zokoxakabu.medianewsonline.com/bgp_interview_questions_and_answers_for_experienced.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/relieving_letter_format_download.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/3883858.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/lisasunazabatiwem.pdfIn PDF document text
    • https://minojesifivu.weebly.com/uploads/1/3/4/8/134860027/vajijozilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_602ad2a7381b4.pdfIn PDF document text
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/basezejufifepudujan.pdfIn PDF document text
    • http://jaxaxanukijomel.22web.org/evolution_starts_with_worksheet_answer_key_biology.pdfIn PDF document text
    • http://linefofaxugedu.mywebcommunity.org/10554016429.pdfIn PDF document text
    • https://gejodawutu.weebly.com/uploads/1/3/1/1/131164152/xirajesifukala_xijififawuxe_bexexagerele_tuteberovubev.pdfIn PDF document text
    • https://sesubovokur.weebly.com/uploads/1/3/4/3/134311777/sonabuvenipoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_60162163948b2.pdfIn PDF document text
    • https://rowozone.weebly.com/uploads/1/3/2/7/132740293/fa53c8404.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/how_can_i_practice_english_conversation_for_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_5fd731846c0f8.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/nilire_nizidisite_kisuzisumo_ziwuvoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_60371bda770c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411919/normal_5ffc81988d599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tigisatobenuwi.epizy.com/adam_lambert_underground.pdfIn PDF document text
    • http://doxewadafexe.rf.gd/stream_of_consciousness_in_ulysses.pdfIn PDF document text
    • http://tutivute.epizy.com/jiwopugo.pdfIn PDF document text
    • http://vapovalexuma.epizy.com/color_codes_for_html_and_css.pdfIn PDF document text
    • http://gudukamu.rf.gd/captain_america_vs_iron_man_movie.pdfIn PDF document text
    • http://kuwerejexamifug.epizy.com/martin_birdhouse_plans.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 6452 bytes
SHA-256: a7a7de384d53cdcb89cda2200443df3fdda661ee1a034c7f49e952d0f50b9eba
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 5852 bytes
SHA-256: 6c1c116f61a7804174f27cdfbb96f6274ce997b9cca72aa0f26fe2aadf3dcc5f
font_02_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_03_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 11712 bytes
SHA-256: 2a6a946c3e322e26e07b1621e63637ff9d2d674776f9aa84de960cf2549c7877
font_04_sfnt_off0001411a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411A 16344 bytes
SHA-256: ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190

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