Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d89bd9e50b0824…

MALICIOUS

PDF

70.2 KB Created: 2021-09-09 22:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac0820d029e60d5111606cc52f7d7872 SHA-1: 14b930c2657d80caf4b7135344089261ffccd37b SHA-256: 45d89bd9e50b0824cd07109bf73c292b9a3e1029d3c33e29cafa1dc67662179c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The PDF contains numerous links to various domains, many of which are flagged as disposable hosting, suggesting a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards a potential exploitation or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae4404559---74464693839.pdf In PDF document text
    • http://heninrealty.com/userfiles/files/kiporugidowejobifaro.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/77788597720.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jenop.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/23334516028.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/dorawopijoraveresowo.pdfIn PDF document text
    • https://guijek.com/userfiles/file/28369531883.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/simet.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/sajum.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/6066753936.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/51339784956.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5abb1771---vorukivirazovi.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/312539569.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/76605869192.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/gunaxebaredederololegoso.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/16418963613.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/mipidowedetudubifurovakox.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/rududesexo.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/pusimizomerowapaninaxozow.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/potagobisodetotap.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/wulidotuderogisa.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/58435261394.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/basuf.pdfIn PDF document text
    • http://harlit.com/upfiles/file/62630734023In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=emulator+for+free+fire+on+androidPDF 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://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_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 10428 bytes
SHA-256: 3570bd5e6dcadc7735374e9e4291f3623f148ea6cd27035b60f1d8f6c522545a
font_01_sfnt_off0000cc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 16004 bytes
SHA-256: 5499d611d0d0f98eff8276b07ca9b9406620a665fd96ada2ab3e2694373681fb

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