Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff401e1cb2ba2f8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 20:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d192c98169559171a41e883236317abb SHA-1: 44bb894380f45ce0238b225c41bc42b406f28e22 SHA-256: dff401e1cb2ba2f8a5110402041bd92d8f318af8ac605c71838e214b8bd358f1
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or link farm attack. The PDF structure and embedded links are consistent with attempts to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=about+az+screen+recorder PDF link annotation
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98041313580.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/gowubes.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/sexuxore.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/86705240162.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/15196169764.pdfIn PDF document text
    • https://msiutilities.net/documents/54364603549.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/63890218081.pdfIn PDF document text
    • http://crm333.com/documentos/file/lijinalebotijuwoz.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///wolijojovujexezazulajafo.pdfIn PDF document text
    • https://trexanh.net/upload/files/93056903044.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/75651436172.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/9718817076.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/30732224925.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/peniza.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/37988723336.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/86762052086.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27cfdfe09---sibenavirajiza.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/ponazep.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/linisuzofon.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210914_BBFC6C1B465E1589.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/72701677752.pdfIn PDF document text
    • http://koddous.com/userfiles/file/37441121735.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/nodupokupig.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/livov.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_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 10504 bytes
SHA-256: deaff8ee91515c718e272e4eb1a7d4cf1a5e3f23e22d528ec57a9e7ae3bc20c8
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 18080 bytes
SHA-256: 966b871b98ebe8d51ca2cb8d0f2bc659f09f631db2f4f5d37a09eb0d3b7a3bb0
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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