Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90b6b6893c578d6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 23:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3c7ca5b4cfe8b6294905e81f1a1238de SHA-1: b8ba05f7dc41d7980a794602f3d9875d756308ca SHA-256: f90b6b6893c578d6caa9931267e7bbe4829ed46a25632716079cbe825392f743
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common attack pattern for delivering malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=watch+high+quality+anime+online+free PDF link annotation
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/ramoxag.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/pizuzegekabasinemekiv.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/munolejobuvojolipelokiz.pdfIn PDF document text
    • http://alvitraders.com/files/12907218678.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/66171127264.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/vagugupajuzavuwikan.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/96518681343.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/fafosiwivesudatovin.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210923132055.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109271250374857.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/kewajubiruwabokodiwowexi.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/zirarupuwojimovisug.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/tufobuzu.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/33699205857.pdfIn PDF document text
    • https://koratspring.com/upload/file/seloguwowokiditidejitite.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486e09e9a4f---61631197947.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/kezosejumasafalixobometu.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/54938904649.pdfIn PDF document text
    • http://lejuriste.ru/files/file/gufutexilemisefenel.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/telalarojobagepipukamale.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613363331fa91---57442848836.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/gasowamonitimi.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/lexexizoxupupuki.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CF 10968 bytes
SHA-256: 21e6a9dbb5b12614e99f0347552791e1ca8f367b16584d35d610051550b4ffae
font_01_sfnt_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 17016 bytes
SHA-256: fbb8aedecc18128dd8e90da64d2e9a98487081083dc014b5f7b5878c9986acd1
font_02_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1