Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ac42c54e8fb89c…

MALICIOUS

PDF

72.0 KB Created: 2021-10-06 15:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e2b32522c8bb0a1c80b5e19d763910ea SHA-1: 42576f6eae5e8d208c02fe761679d0394b3cbb02 SHA-256: d2ac42c54e8fb89cbfff6097866641d23d551a53fb99157e3d247e6c17c8da36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URIs. The PDF structure and the presence of multiple embedded URLs suggest an attempt to lure users to potentially malicious websites for phishing or further payload delivery. While no scripts were explicitly extracted, the PDF's nature and the heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://chcial.ru/uplcv?utm_term=classification+of+parenteral+products PDF link annotation
    • http://sintellect.ru/Repository/file/51179110016.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/8072750650.pdfIn PDF document text
    • https://netpage.info/userfiles/file/34964982021.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/vupegigo.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/bavelafonup.pdfIn PDF document text
    • https://hinaweb.com/upload/file/jibulimatukejepinodenu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d0a1e737---49196259822.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/dulumikimilugaj.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/wozafijipuxibusinirezuzi.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/zokatozozuzuwasow.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/rekarukumubu.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/84202039819.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e614ea74cc---12868404639.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/luletudodotenab.pdfIn PDF document text
    • https://mcgbaharat.com/userfiles/file/danitisisano.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/sovuxuduzavotorowuvomujo.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/66407765990.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/fepeginodafaremevir.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/72763984285.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/54221065849.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/29104152272.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/31098323127.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/sodopuzip.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1615251427f2d1---48368778159.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/87841872843.pdfIn PDF document text
    • https://pt-olympus.com/contents/files/nevizivulu.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_off0000b9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CD 10744 bytes
SHA-256: fd6a9e97344a836111d513afa6b2052f63eda90ee6c49c555a3ba7735101016b
font_01_sfnt_off0000d29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 15332 bytes
SHA-256: dd3e1a41d14720b5fa20bc38d05a9a9a59517898e0729b16319c623b442c3228
font_02_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1