Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5078859511f4a2b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 03:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cb0f85d78e5e976d7ea34b72acd59f72 SHA-1: b28a133cd6832b150dd346024e2cae654a8aeb73 SHA-256: e5078859511f4a2b0d0eb83f0790ecbc18d73d5834288a26bc6b9b4ae7b78436
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, pointing towards a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://aotwcasino.com/ckfinder/userfiles/files/toropizifefedoba.pdf In PDF document text
    • http://euroambulans.pl/userfiles/file/16491355222.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210904012139.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/1987632803.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/88534502635.pdfIn PDF document text
    • https://davnosti.ru/upload/patojubobavodaba.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zidufiwexisonerivokuwej.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/30188772918.pdfIn PDF document text
    • http://prompol.com/media/file/7783856824.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/101838239460.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/80293551879.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/11549651957.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/xurojifodusesu.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/pimonujadagogegojomer.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/kiduxa.pdfIn PDF document text
    • http://fitviewer.biz/files/file/nasozozobusogalopon.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/26854083549.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f31d3b2f52ff209214cdf63dba9393dc/guveruvezikixoxusekalolur.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/43377766315.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/60667562541.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/junapogetoxosola.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/mogizamer.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/81653240087.pdfIn PDF document text
    • https://luminex.pl/upload/file/zazatalopatuvugivobijesa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161381d0ab11a8---kulibagadu.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/xuwovanodimobowiwetupij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=traffic+rider+mod+apk+new+versionPDF 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_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 17496 bytes
SHA-256: c737525ea4e9b608d4305213d677c696af784836adc298e14fdd7ced8b1b59b0
font_01_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 10844 bytes
SHA-256: ab08b98b623ec305d5770bfe62506b3f4c55e11f3cb42d0f5b31eec6a89d3a48