Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde500553fb2b4a2…

MALICIOUS

PDF

75.1 KB Created: 2021-09-12 03:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91cec1ab68e92c47bb8b628e71501f00 SHA-1: b8cd5bc09c227c98432a89e895acfd4cb5e18e83 SHA-256: bde500553fb2b4a240ba6c96dbb2456ebaba70958b651c2ece1d286df343eb4d
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 high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users, likely to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=speed+racing+3d+mod+apk PDF link annotation
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/50411841135.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/82856694753.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/55089506978.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/xewoligiga.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/getoli.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nabiwidebo.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210911215156.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/52983308251.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/sunomofinelireriked.pdfIn PDF document text
    • http://vhshf.de/File/vifibovesemume.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/dubokilureguzidoko.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/64414777162.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/30588790828.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/kisesanisimudagodorof.pdfIn PDF document text
    • https://ancoraeducacion.com/images/vavifivolonaxanudumixu.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tupamowewe.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/63805978259.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/kasegagexuga.pdfIn PDF document text
    • http://sbkf.org/files/files/wejipevaramesidixofome.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/sanadazixodabewot.pdfIn PDF document text
    • http://machin.kr/userData/board/file/10151559956.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/xulutinusafagi.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/bigunivuxewanev.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/44186689690.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_off0000bdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCC 18524 bytes
SHA-256: 80a9471e6ecda39a6e53fd9501572ff5a92667a0fc020dc4b54dedb6b00ea698
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 10884 bytes
SHA-256: 343d1fc3d862779c9e6acc784facbda7637a4314fef5f4acc5b7c6938c7fe762

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