Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c48e0820dff1c8…

MALICIOUS

PDF

76.1 KB Created: 2021-09-23 13:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b70aee0c83fbec961fbd211057be61c2 SHA-1: fdd4fbbf29bd43e30ee2888edc47f8af2e842fbd SHA-256: f0c48e0820dff1c861a5059b286f5007a7a1152a7d13702839d4087b2781c91d
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the document is designed to redirect users to multiple, potentially untrustworthy, domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://samtekelektrik.com/files/6246147833.pdf In PDF document text
    • http://uco-kampen.com/media/files/44426907955.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/xazejarofafijeref.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/jadorerisibanid.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/mevoda.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/85116595702.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/25634581039.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51a05b924---runuwijulagokeditadegi.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/xupelupatejo.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/13106014068.pdfIn PDF document text
    • http://gazetavk.ru/img/file/51629022269.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/17940885277.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161411907989e1---78256224189.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/82077292088.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xidevizopolejulej.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/75595194203.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/dijisakoguzip.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/vutasujijofaw.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/79878584260.pdfIn PDF document text
    • https://tanvietnamdinh.com/uploads/files/36609296996.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/judixed.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/37963583792.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/54309461583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=programming+with+angry+birdsPDF 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_off0000c56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 17112 bytes
SHA-256: 50b793ed820a1c7e2f9db33d65a362709186d80cc0b12e40bc4a996abc322b8e
font_02_sfnt_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 10856 bytes
SHA-256: 62e9484f97d0d93159e7808fac1e6bbbd1335de7d09efab78c18c3ad50215edf

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