Malicious PDF — malware analysis report

Static analysis result for SHA-256 a720f1383b24b869…

MALICIOUS

PDF

94.8 KB Created: 2021-03-11 20:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9044121668889c7469f8ebae7359b0fd SHA-1: be8a9b7d8041d51444effc85e5b6877ef99e4779 SHA-256: a720f1383b24b86928af5170f145b2774deee1ad2f214545a64ec3a704cac064
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to game save data, likely serving as a lure to direct users to malicious sites like 'https://gimoguvi.ru/123?utm_term=burnout+paradise+xbox+360+save+game'. No scripts were extracted, but the PDF structure itself is designed to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/123?utm_term=burnout+paradise+xbox+360+save+game PDF link annotation
    • https://cdn.sqhk.co/xororasomig/eji2jeE/bosufuf.pdfIn PDF document text
    • https://wanuwajazil.weebly.com/uploads/1/3/4/8/134899981/movugokezo-najadevilifijib.pdfIn PDF document text
    • http://zeraseb.66ghz.com/8196718747.pdfIn PDF document text
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/150b2b460bd398.pdfIn PDF document text
    • https://jigotofobab.weebly.com/uploads/1/3/5/3/135300724/fulizetiravodo.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/hj5PXNV/wanuxapaxijebitutapepix.pdfIn PDF document text
    • http://nogibuxaniru.iblogger.org/download_zelda_ocarina_of_time_3ds_citra.pdfIn PDF document text
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/kuxekomakatezadu.pdfIn PDF document text
    • https://cdn.sqhk.co/rogekanus/fgfpKwH/coin_adventure_a_reel_good_time.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/ihicehg/508869762.pdfIn PDF document text
    • http://lerob.info/manorama_news_paperpdjon.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/Vhcihhi/71119879752.pdfIn PDF document text
    • http://catsism.com/which_of_these_is_an_example_of_involuntary_alienationonv6n.pdfIn PDF document text
    • http://gubuzikutavijuf.iblogger.org/95580247046.pdfIn PDF document text
    • http://lessonsonline.site/1uobpc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://wawutanow.epizy.com/38676054997.pdfIn PDF document text
    • http://xuxusemo.epizy.com/ketogi.pdfIn PDF document text
    • http://wegijadisi.rf.gd/suprema_biostar_2_installation_guide.pdfIn PDF document text
    • http://wafutevulutud.epizy.com/sazesuxanupumezezorupa.pdfIn PDF document text
    • http://fukoter.rf.gd/megesalu.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_2e8f233dbdfb474cbecf99a9db46e3eb.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_4e940980fd8c44459068ed213661ede3.pdf?index=trueIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 6024 bytes
SHA-256: 852164c12fdf6c937f94ceb38ddb8f16c3b5b09a0515c2a75a3c9258f301d103
font_01_sfnt_off00011c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 3740 bytes
SHA-256: 49a7b6a6022ad0750f3ce9b713f85c7cd2f2c955e32e46ddff28ce33b45939fd
font_02_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 13100 bytes
SHA-256: 4867f3c35604a7df1411f9fbee084b70a60bc0b707e08bb84620877d16f67e53
font_03_sfnt_off00014fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDE 8904 bytes
SHA-256: 7c27146a323c3f7017aba515fa1310326218bc1d13721735011c7e376860942d