Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5c1d9332a71909…

MALICIOUS

PDF

87.6 KB Created: 2021-09-14 12:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3a327b21eee2e9bf3bdfc48fd015821 SHA-1: c949b2907823a2203dcb2c41adbc3bfe2e0309e8 SHA-256: bd5c1d9332a7190986c832988b8db8d5e7252aa46f80de896f5982f0e886be42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of numerous embedded URLs, many pointing to unknown or potentially malicious domains, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure, likely intended to redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/3400311287.pdf In PDF document text
    • http://foto-recepty.sk/images/fotky/fujobufuwotidejaxekonuwom.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/16711043821.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/10532092915.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/samiw.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/29032911288.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/letukovufut.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/vatidedufiloretuluz.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/notobakedutikonakat.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/patukebazuwedilepamafura.pdfIn PDF document text
    • http://446888.top/userfiles/file/mibupiguzijuf.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/22046765654.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6115251a---rumipefukufaru.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/letikel.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/80611553560.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210911_15AA211209F13B49.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/buwipi.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/waxuf.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d5074a4b---vofaruvo.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/25473848220.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/buxewoligo.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/jadoxikotewajaroleliki.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/26790912248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mtp+usb+device+driver+for+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://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_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 19344 bytes
SHA-256: 51d18727799f491ddaae3d1ce452ce24f0e7b26a3532fc27ed1f8c0642256d43
font_01_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 10868 bytes
SHA-256: 00d9d72af6cedc99a7672a14037a64ca36d79116fa4efc12604f2fb1719b0a03
font_02_sfnt_off000138d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1