Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aec48fe0b7d8072…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 18:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cd1336d671ad79025309222a3b68c4e SHA-1: 3dcb19c22444ddd5bcaa0a4c9ec85ffd9776fb7f SHA-256: 8aec48fe0b7d80726f108408075432d8ce9505ad2f7461681ab71eb77e97366f
66 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a pattern of small PDFs acting as link farms on disposable hosting, suggesting a non-malicious intent like SEO manipulation or potentially distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 4

  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1b8f1ab2---zovomesarewagapawelavod.pdf In PDF document text
    • http://boschvietnam.com/files/usersfiles/files/wipojoviripabu.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/62856005542.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/37781372427.pdfIn PDF document text
    • https://nistd.in/userfiles/file/78299459386.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/16968725238.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/mugikuwamamozuxufonired.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090720594068.pdfIn PDF document text
    • http://deforma.it/userfiles/files/tokatumanikuvowimozugivit.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/78052861714.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/13115454635.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/nidagoduzitowedan.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/79266181057.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/mopituwivuzolonazixa.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/pujepolimifimaxatasubuxu.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/zifoba.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/31309050349.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/bujuvawawinemetexetesolow.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210905214602_j0afcs.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/796314361.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/87459958228.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/bebuvopozoromidudeko.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/49856298616.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/58979382288.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/22644466632.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/81098125460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=create+a+button+android+studioPDF 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_off0000c45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45C 10468 bytes
SHA-256: 746e5ada8f9ee180b06a5daa4b6463f3bb87a763e6fd62a58eff14016d273f02
font_01_sfnt_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 17040 bytes
SHA-256: 93110daa6ecfde91e83420d3fe1d9d83631254d681c9adbf922056e2fdb0eb7b
font_02_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1