Malicious PDF — malware analysis report

Static analysis result for SHA-256 2411781636b08641…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 00:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21cd1c18aefff4eda944850043a2dbd5 SHA-1: 79a075e93fda2009680b3fd481cd60b4854ee9d3 SHA-256: 2411781636b08641dd01633d64e6c2739036cd141233c69e9f235b1fd3657b31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://archism.ru/uplcv?utm_term=super+tank+battle+mod+apk PDF link annotation
    • https://sdhouse.info/ckfinder/userfiles/files/lirapujepevalotegoxugoj.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/32819828104.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/3573975788.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb3c8ee2b---92971478032.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad7ee5e50b---kasupilugejata.pdfIn PDF document text
    • http://yongqingtech.com/d/files/wixetozekerefijiredo.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/sinajigi.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/tobed.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/10421126102.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/6796476913.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/sukapubazobapekuxudipenas.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/vewosebidizonijabosugabu.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/jenuradugudasawu.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/voxosamobu.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • https://aquatrustfina.com/userfiles/file/vodesojuwinivevizileb.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/vupikivododu.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/sefixamexamatefewabunisug.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/90077608747.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/46152213874.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/48996606557.pdfIn PDF document text
    • http://santeh.md/img/files/xejufedepoziwuwufenuv.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/gelotogowuf.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_off0000ae16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE16 10700 bytes
SHA-256: 8deaf5e7c8b98f79e91dc43e9f175ec004e94f42938a4e4246f4f2968a2ea945
font_01_sfnt_off0000c664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC664 14608 bytes
SHA-256: 0aa64d861f64982e877d70736d163af58c2d9462ec1fcf24d9409417a416f98d
font_02_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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