Malicious PDF — malware analysis report

Static analysis result for SHA-256 df23980b97b70207…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 23:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75036f3c9e509f12ac4434cd86d9e611 SHA-1: 109a779b2420fddb00fe2974397c7709f4d5a636 SHA-256: df23980b97b70207055d483f356649a2c3f426d3d5f5dfcfd3263279ad8992d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=battery+full+charge+alarm+app+for+android PDF link annotation
    • http://rainhouse.kr/data/editor/file/2140449526135d5c0a87da.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/4437045130.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/guwerinezefetamomoki.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/milubipudus.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109060137415302.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/39122765220.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/guxasolepukezo.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/75553275275.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/tezinisurotitipinisiwa.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/wavurutuwenuwanine.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/62610536071.pdfIn PDF document text
    • http://emeat.ru/var/files/3069581299.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/temozadejuzowusikikokowap.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142675192905---mezorajozadopirugewak.pdfIn PDF document text
    • http://blueyee.com/upload/file/131537342063.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gumik.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fqec1a6nn7uhoktroulfssnjcq/25695453546.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/33408393232.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/82918459331.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/4766385347.pdfIn PDF document text
    • http://air-ned.com/uploads/files/99706660726.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xekokezad.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/peronefibexokilosusura.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/78365210935.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_off0000d355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 17156 bytes
SHA-256: 669e77fe94c83a4e00731f7c3b60d308afee6b406df99b554e64e8a90c4a71b5
font_01_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 11168 bytes
SHA-256: 250a1a68399f055696a51d08e3799e1d4946070899368a204d59faa8e74be094