Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc724861ecc4d193…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 14:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad4745725994aed917a8b5b7e3101b51 SHA-1: 5bc0930041bad409c976b937304d05bac84d4bad SHA-256: dc724861ecc4d1939e3c5ec6c45e28f03a032d40f846b04dcc83170d2e090cee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous distinct hosts and external URIs, suggesting a phishing or malware distribution scheme. The embedded URLs point to other PDF files, indicating a multi-stage lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f27a7d07f---53699494980.pdf In PDF document text
    • http://feminella.ro/upload/fck/webipekilin.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/gegofivedexuw.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/fenorujofumatetebux.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/tijegotofowukuximefozo.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/bilofewixamejo.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/tonukidisorigexid.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/77862561144.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/rikokulalatizeme.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109141226341106.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/vimigobefigusetofekisefa.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446628c378---39904912135.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/87243660748.pdfIn PDF document text
    • http://snft.ro/media/file/zuturawaneta.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/felusenoga.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/70194563089.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/suximem.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/67511390060.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/bedisojufiziru.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/29902410393.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/86890056412.pdfIn PDF document text
    • https://12shio4.com/contents/files/garazokakufebikime.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/72491203347.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/xozulomikukivexagakorenef.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/13822067947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=perfect+day+legally+blondPDF 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_off0000b489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB489 15716 bytes
SHA-256: 11681943593abe64a2170591961a563aba81882e54e6b072bd825caa64926b6b
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 10648 bytes
SHA-256: 983a8f6930e62881b2812d65da767284ac010795d34030f301f14181c99b777b