Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeba56b8b19489b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 21:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: de48ba31c1d5fa3eb928ddc02b44e7ff SHA-1: 0cb153a2b6829170a457c5a8d8350547aadd3d63 SHA-256: cdeba56b8b19489b84e657448c4c9c9843536b62c1cca9deef4463e90abe3d43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, indicating a phishing or redirection attempt. Heuristics flagged it as a link farm on disposable hosting and a malicious PDF by ML classifier and ClamAV. The presence of embedded URLs suggests an attempt to direct the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=how+to+clear+cache+files+on+android+phone PDF link annotation
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947076e608---jajobotedosojavuba.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/81661808538.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/kirupanilejumulepo.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109022233184118.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613756be6ff44---bokupise.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/19546981545.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/80991274855.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/zelowogonafifiwibew.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/9652828055.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/xodogiritetenukerorujufu.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/61675108600.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/31119500307.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/nifuwimogubotojo.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/rojaboka.pdfIn PDF document text
    • https://bawauang.com/contents/files/jitatewewel.pdfIn PDF document text
    • https://yodobashi-church.com/jidofanisazumozokazi.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/dolikowasukamuxubimowuke.pdfIn PDF document text
    • http://esistore.be/userfiles/file/79787402631.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210910200649.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/35217132832.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/saxegilabakabegiravi.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/85900091519.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/wejube.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/duxesewesadinesitajane.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/tubetofibulekis.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/gorewik.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_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 10796 bytes
SHA-256: 16e0f5d7387dd60ec0baa9fbf57d82a44b25d7024a89225b49d19c7449bdedd3
font_01_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 17640 bytes
SHA-256: 93a59f8967111306999d9fe705aac1a822f3d981c9516eee067acc5b8bdd4130
font_02_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1