Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd2727543608346…

MALICIOUS

PDF

72.5 KB Created: 2021-09-23 19:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fadb6ac6fbe636319c55b0c5c5273f1 SHA-1: 3489ceae9c4e445ba0659ae4cd4951039c3f9973 SHA-256: 3cd2727543608346d4b07d4cc35e73189d5f316d67f9aeff17434379855e64f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to suspicious domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document is a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=123movies+new+website+2021 PDF link annotation
    • http://miydz.com/mingyi/images/userfiles/file/babudedapewutudefixupi.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/judebufinujopaxavizi.pdfIn PDF document text
    • http://humanlitech.com/files/files/32366033419.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/61878212207.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/51209648044.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/86638351735.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/wifar.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd247f298b---wulizewowa.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/19977523408.pdfIn PDF document text
    • http://didopack.com/files/retelul.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/99904524802.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/tuzojerotililaluve.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/xizos.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/53605021242.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/7749528156.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/jezozerabopef.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/29091097794.pdfIn PDF document text
    • http://denge.aero/upload/files/rififilaxabivuxomaseva.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/4573141694.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/44825354215.pdfIn PDF document text
    • http://jiab.net/userData/board/file/lusem.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/nogexi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449877c1140---83580000637.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/bisutewojuwujuwerex.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_off0000b5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BA 10624 bytes
SHA-256: acf45d8055d09cb65656f4e3a101d96cb7a90df862a89eb66895e91b3819dc5c
font_01_sfnt_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 17668 bytes
SHA-256: c8cbb4ef0054cc6c59b85a1d7fbfd3a004f79a7673b339880c6a5c6e07c4fde4

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