Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0cdeec52402707…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 17:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c81acb5d9cae25e4d4520a7b55796636 SHA-1: 5478fd7b0e734a32638da2395f59f9cd9c701b54 SHA-256: 1f0cdeec52402707d1c091118e346020d469dde754d04bc61a26a0de050463bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on unknown domains and appear to be part of a link farm, suggesting a phishing or credential harvesting campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or the use of embedded JavaScript to facilitate malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mgogs.com/mgfiles/file/mamowigufol.pdf In PDF document text
    • https://thietkewebseo.com/webroot/img/files/97237508859.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/91291402875.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/bejiditobe.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210914054837554.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/gupufir.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141b79062415---54634679089.pdfIn PDF document text
    • http://gysanya.com/upload/file/210916215031247731ebdcmaubwu4p.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/59499686005.pdfIn PDF document text
    • http://ministerium.pt/files/53598998627.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/97291714339.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/21978837207.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/vubam.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/fizobawu.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/liginedidulewegijetapov.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/99051777398.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210907_D461879A62420D4D.pdfIn PDF document text
    • http://evola.it/userfiles/files/pugisoxobufominedudoj.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/putibaxo.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/xegifuzuributomaposur.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/24805846909.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/31738126336.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/20203761598.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/94697255913.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/6f6f0e0fd2a9bcc28c8307804b25f6c0/47943551704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=clear+all+cache+android+9PDF 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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 17832 bytes
SHA-256: 24ee351cd2a73a6c448c9f855cd78eefc187f5614eaaadf8428b1daafbdbde27
font_01_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 10400 bytes
SHA-256: 38a9750b1c678c19b87ae345d38f9d93b55e0bf705f86e61fcd8bf936d728900
font_02_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1