Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff6815f62e22bbc…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 03:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2357bccc7bb131c2e1168f8a1b3a979f SHA-1: 3596b1fdc3605b5644498381bb5c48c1c9140127 SHA-256: 8ff6815f62e22bbcf9a4715469a90d59d4edb96d818eedea9253651874c2b54c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with one heuristic explicitly identifying a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=fervent+priscilla+shirer+study+guide In PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/weximazogov_rarebuk_voxosojine_palixuv.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/hiz4Qhb/real_gangster_crime_simulator_2_mod_apk.pdfIn PDF document text
    • http://kuvesukide.iblogger.org/61082346887.pdfIn PDF document text
    • http://robinmani.site/diwuvafaxapibokazvywlk.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/eCEhXhh/65316584257.pdfIn PDF document text
    • http://br1.red/cardcaptor_sakura_wand_templated8svq.pdfIn PDF document text
    • https://fanonobumoxevo.weebly.com/uploads/1/3/1/3/131384335/nofeze.pdfIn PDF document text
    • http://monufovaxuj.66ghz.com/blythedale_children_s_hospital_annual_report.pdfIn PDF document text
    • https://durabikat.weebly.com/uploads/1/3/4/5/134512276/3210518.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/geicVge/wolf_online_game_pc.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/2df8d.pdfIn PDF document text
    • http://instapriz365.site/gobubu1xd2i.pdfIn PDF document text
    • http://lasinonid.iblogger.org/41868370666.pdfIn PDF document text
    • https://lupiwofuguneb.weebly.com/uploads/1/3/4/7/134715795/nixulutob_subugig.pdfIn PDF document text
    • https://minoximamus.weebly.com/uploads/1/3/1/4/131437876/87c783d4dd67f56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mefetapa.rf.gd/xisip.pdfIn PDF document text
    • http://tutivute.epizy.com/converting_units_of_time_worksheets.pdfIn PDF document text
    • http://waraxiv.rf.gd/79601178718.pdfIn PDF document text
    • http://novosumagib.epizy.com/periodic_table_o_level_notes.pdfIn PDF document text
    • http://bapuwejotip.epizy.com/12107530166.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 5452 bytes
SHA-256: f600a5f4aa53b8673575dddd0a297da289c100e0f57d33a24227e3af9d147110
font_01_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 10532 bytes
SHA-256: 66851ba39e1d7491a10191b8391620db913fa6916abb968a10ee9e207963327a
font_02_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 16096 bytes
SHA-256: 85bd41ddbc154cc0492202ad36e6a86021cbfd2de434127debc37966f98804c2

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