Malicious PDF — malware analysis report

Static analysis result for SHA-256 1608d5cac227fe66…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 00:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17ea0a1be8afb6e898b2aef9f0f6c431 SHA-1: 1c5b81d37a141234b94993192343fe66a9dd3b8b SHA-256: 1608d5cac227fe66962f2c6226665da25efca8ee6b0094436fec3b1ebb336cdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. The embedded URLs point to various domains, many of which are unknown or potentially malicious, further supporting the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://balmbeach.hometeamcorp.com/images/usr/55600051957.pdf In PDF document text
    • http://rcp-ranstadt.us/files/10758848665.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/85026839442.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/resizisekegelopawelu.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/67099835869.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/75894112640.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/58676229219.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/wejefaximujesikugito.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/sagor.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/369ec31e08f70bfb5c35d48f76be3732/gipoxumazujexefi.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/27599930241.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/futafavogavekofuxene.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/momojivivuluzurir.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/06d0b223e255c7df879c59f016b4d0bc/rasopuwudunamizivip.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/4483720603.pdfIn PDF document text
    • http://skia22.ru/pic/file/15915051245.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210912_022322.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/zemolejejuguwavas.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/babetibagidiwetubu.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/45694892670.pdfIn PDF document text
    • http://vaynhe.com/upload/files/jovoretusanezaworip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tamil+new+movie+hdPDF 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_off0000b0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FC 10264 bytes
SHA-256: 3085eddf1a35b80bd3089e777d3b5750da9d559b04524c782afe61be777261f1
font_02_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 16812 bytes
SHA-256: e9d4542c29e471caf588bda5fef3d99260e3c699fcbb4a4483a4fc66974ab44e

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