Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30f80c7bcffcd35…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 03:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87ba56d6c175726c58fc9dd27cf50e7f SHA-1: f37d6b33db9bad9532a0341f0d2493f3c2d3ced0 SHA-256: e30f80c7bcffcd3551f0af1fc2bd0966a147551e272a9f81134b2b85b210d797
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristics identified it as a link farm with numerous external URIs, many pointing to disposable domains, suggesting an attempt to manipulate search engine results or distribute further malware. The embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://qdjshg.com/files/file/nejopekuwetodopafexo.pdf In PDF document text
    • http://location-venise.com/italie_documents/files/14252647282.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/65896560332.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/9407161.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/nufivadekopexogukajudit.pdfIn PDF document text
    • http://allier-genealogie.org/File:/vitokutop.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/38519974230.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/93344195660.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109041317079956.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/xafefativazotarewogufulup.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/rukefuketule.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede1e9531f---46988592035.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/87221228003.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/12956451602.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b59212cdc---zigobakuvolizaji.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/29636383823.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/59549656154.pdfIn PDF document text
    • http://roocenter.ru/upload/file/dowukizubugimefos.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/guxoginig.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/73908507640.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/87590873117.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/30004288130.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/82585748989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=my+virtual+girlfriend+apk+full+versionPDF link annotation
    • 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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 11040 bytes
SHA-256: c1aa00b8b93dc07a6364dc4414c79b099551752067cac97ec8d5736f51402f06
font_02_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 18708 bytes
SHA-256: 1e794ddaefbb80ab0156a4edbb50d24828c5c29f32e62a16b257727f3901dba0

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