Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ceecf1074d4e8d…

MALICIOUS

PDF

88.8 KB Created: 2021-09-15 12:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e5708918c983efe11406036effda04a SHA-1: 584404aed37b8e61b7310b866f63445f2794c846 SHA-256: 15ceecf1074d4e8d625143ac16eeb8abb461d205fdf386cd25691fedae9c9d1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including a link farm on disposable hosting, suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://huntic.ru/uplcv?utm_term=best+pokemon+nds+games PDF link annotation
    • http://ominocoibaffi.it/userfiles/files/setekupomexemedoleke.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wumufada.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/45040004389.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/fafoxaxenatotinavakipeluv.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/dimered.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/97597292756.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/jujepinumibopigofukob.pdfIn PDF document text
    • https://coil.hk/upload/files/17045003989.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/50178031974.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/18182064918.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/totabixewa.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/31644084554.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/20882109573.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210904045647.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/79844272864.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/98086874023.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/45805049234.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/49794527433.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/velatuvenenatofivasir.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/lugezowikorejegitugivebis.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/45516611041.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/zemevuxivele.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/562514587225dffe3d79520c26ee2927/pefadipowa.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/tafedimanilajopefaj.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/69763382990.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/68820088093.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_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 10644 bytes
SHA-256: b7882e8cd5051d7177ee388ed08159bc9c264d802412b82b061a9ccabc4dc64a
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 18860 bytes
SHA-256: 389f1595ff566935876ae17974d9ab146b74812406aafa58c747b5d4b2bd453e