Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef9ca12111303c3…

MALICIOUS

PDF

82.6 KB Created: 2021-03-10 12:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a48d2ffd940d2095d757e818ab43961 SHA-1: 9e8e093dbc55ee68e1c9c3b08a874b8f8882f07a SHA-256: fef9ca12111303c3d8998aeb81adf6d4de71a6e3f8de7d87deb299026170c5e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities to execute code. The presence of a large number of external links, including a link farm heuristic, suggests the primary purpose is to redirect users to malicious websites. One of the embedded URLs, 'https://vilenefex.ru/wix?keyword=world+thinking+day+2020', is a strong indicator of malicious intent, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=world+thinking+day+2020
    • http://nexofozupugasi.mywebcommunity.org/que_formas_de_expresin_oral_existen.pdf
    • http://zoom-omsk.ru/15085916821gr7ek.pdf
    • http://pressit.space/yamaha_jet_boat_for_sale_houston_txjyrcd.pdf
    • http://solapp.xyz/41485696522fo4wm.pdf
    • http://ridovise.sportsontheweb.net/articulos_de_la_constitucion_mexicana_que_hablan_de_la_familia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/limepusotanal/merkury_innovations_apollo_earbuds_review.pdf
    • http://pomirunorejuso.epizy.com/vosusula.pdf
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_e90fb6c56c48433fa598fc37aa4f0e89.pdf?index=true
    • https://s3.amazonaws.com/jovekus/old_bose_radio_manual.pdf
    • http://mifotabelimudon.myartsonline.com/alfred_piano_book_1a.pdf
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_a5923cc8e649422c97cb86790c63be65.pdf?index=true
    • http://pitefabe.epizy.com/mujalorenaxisudujuwis.pdf
    • http://kakasis.onlinewebshop.net/70408957854.pdf
    • http://fekerudosepu.rf.gd/jasagopug.pdf
    • http://xusapibu.onlinewebshop.net/lisawosexu.pdf
    • https://s3.amazonaws.com/vezumobigodub/trails_to_walk_at_night_near_me.pdf
    • http://lunijikujapike.epizy.com/navigation_bar_color_android_java.pdf
    • https://s3.amazonaws.com/tiniruru/lorumexakemaponiwu.pdf
    • https://s3.amazonaws.com/sifawekujiki/56057429249.pdf
    • https://s3.amazonaws.com/sumesawoxajew/agneepath_2012_tamil_movie_720p.pdf
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_4bd3e03ca67344b59d8c32837ebe1303.pdf?index=true
    • http://putesedesupelo.epizy.com/formal_dress_shop_au.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f845.bin
4d68e7d963b4e26701c8d919905e824bae65cc98166e35452ed24b61d9c0fc2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 5032 bytes
font_01_sfnt_off0001095b.bin
6ac049e752097c600f8ec09d903fc16a006e83524852b2384a10d4ba0ce4167c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 11008 bytes
font_02_sfnt_off00012efa.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFA 4324 bytes

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