Malicious PDF — malware analysis report

Static analysis result for SHA-256 24da6c311610729d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 13:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48b6a9dbd40d1aed661edfcb6a93fe2d SHA-1: 777e0a21a94fe0a32d26f4facfff469a1cc5cd04 SHA-256: 24da6c311610729ddd2ae19366aba2db914a53bb182caac505a624744a7a4870
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a 'link farm on disposable hosting'. This suggests the PDF's primary purpose is to redirect users to potentially malicious websites, likely for phishing or to download further malware. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://rzfmuhasebe.com/userfiles/file/5020261631.pdf In PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210911061539.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/topin.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/66371815371.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/fesofanonewiponenujisodo.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/lobeta.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/41009085542.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/64111755961.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/52609105036.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/15081397567.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16141ab5125809---94092845873.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/68430876435.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/47496698844.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/lolurevufanudurexu.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/pewitukoxirofewemuxaki.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c67d6f320---59070800582.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/bazigatuwogidedo.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/gemegirififonopod.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/bifixaribapuse.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/jadigatufar.pdfIn PDF document text
    • http://unseretochter.com/images/file/13639343329.pdfIn PDF document text
    • http://viorina-deko.com/images/file/38353919047.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/nejupifomoz.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/42968987071.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/62851188654.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/feninavudizuruko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=zen+and+the+art+of+poker+pdfPDF 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_off0000b204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB204 10344 bytes
SHA-256: a0e402e793c1602fb14a9692225cdfc6cd53859bc02f6ba4762bc030cea27977
font_01_sfnt_off0000c94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 17100 bytes
SHA-256: 9cc9eae476812874bd00216002ccc926f4aab720d979ef6bc8ec7856c321d2cb