Malicious PDF — malware analysis report

Static analysis result for SHA-256 220f763fea3e7ec0…

MALICIOUS

PDF

85.6 KB Created: 2021-03-22 15:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5c160db3a13afb1d0fa730a8b85f6845 SHA-1: e2d0686561ee9c861318379420a0593c25372523 SHA-256: 220f763fea3e7ec0b7db41f0478fdfc3fdf018a0428d2cab303f3f9a0fd9d911
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/strik?utm_term=self-reliant+meaning+in+easy+urdu PDF link annotation
    • http://wizomokupelew.iblogger.org/promissory_note_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/4wThiii/dino_city_rampage_3ds_cia.pdfIn PDF document text
    • http://vajamerafimal.iblogger.org/finite_element_analysis_solidworks.pdfIn PDF document text
    • http://xelipev.22web.org/54515582034.pdfIn PDF document text
    • https://cdn.sqhk.co/bisozowinala/ga0shcP/15648778209.pdfIn PDF document text
    • http://nomokosu.iblogger.org/clean_sheet_ne_demek.pdfIn PDF document text
    • http://lalomazufoza.iblogger.org/31610747659.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/5WdjiOd/fipirotajevuvubomol.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/hcteiaN/bejoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/8rxiaCA/xuzodes.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/w8gihf6/all_crowd_control_games.pdfIn PDF document text
    • https://cdn.sqhk.co/lutumodigi/oASgwZz/analytical_methods_in_biochemistry.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/ZRiibQV/packers_practice_schedule_today.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/dwU02jj/41333049963.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/jcdjDjf/baumatic_dishwasher_manual_bdw65s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punegejofuj.epizy.com/masemomaliwemivoj.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_a802f59b26b343f5880f9f55defdce1c.pdf?index=trueIn PDF document text
    • http://fijoramobizedej.epizy.com/baby_chameleon_care_sheet.pdfIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_7e64460fa658462888755f83b8b50e72.pdf?index=trueIn PDF document text
    • http://fusiwati.epizy.com/26158891248.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_4cb42f7d392743b9a039abdf7b71d98d.pdf?index=trueIn PDF document text
    • http://galikamot.epizy.com/wipiriruvinubopeve.pdfIn PDF document text
    • http://sejabozewilobog.epizy.com/bootstrap_template_form.pdfIn PDF document text
    • http://mutodavop.rf.gd/54371665799.pdfIn PDF document text
    • http://wumevejuraluxe.rf.gd/vojugetidej.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000124bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124BC 21148 bytes
SHA-256: c3795ddec0069b470e09770ff1469be8db59b4692a894eff0b9ccbe8f951a6a7
font_00_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 5464 bytes
SHA-256: b873d2e6c445fd68151623e7725d197b7a3a0a2f0d40757b6a77955422965b5b
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 11488 bytes
SHA-256: 1d5657b9b01a763fb3238a9bcfd106c0f021a2a21682ac11aaad6006e20d2fcc