Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e2cc50612b8e57…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 13:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2d831b7a194a3fb7fbc5b2776633786 SHA-1: 13285ad07cbf2fcfe89e1f8c2ccdae00552db49a SHA-256: 70e2cc50612b8e570ff5654d69f8a83fc5309ddbac2eed9c025ecbdd67ace099
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, and it contains numerous embedded URLs pointing to unknown or potentially malicious sites. This suggests the primary purpose is to redirect users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pcccphucvinh.com/upload/files/bomewatodawetesodon.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ecaaa1273---jukekobupaxebevalodib.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/84020236880.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/keduviweluximatapafunap.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/rakaboximuma.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/xuxupijumuzomil.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/31021161369.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/87689070403.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/jedepagiwew.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/3958886723.pdfIn PDF document text
    • http://rhondachem.com/d/files/14487264847.pdfIn PDF document text
    • https://baongochoa.com/upload/file/13424205325.pdfIn PDF document text
    • http://wych123.com/upload/files/54549575605.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/26551787270.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/6958897706.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/26031167414.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuver.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/fazoxunovulij.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/67747682328.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/binoga.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/nikinavafoduveje.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/61050044761.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/40081129162.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tosogovuzokojaliva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lil+wayne+gone+til+november+pdfPDF 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_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 11036 bytes
SHA-256: 8119f84e6d8314c6d13cc6a87561423b678f26347a66c1ae2817509cd023e20f
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 18792 bytes
SHA-256: be501ca835f2492632f248df6f226df0c5a8db81136cd88e003b754540cc4610