Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b70834de5ace7e…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 07:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcc590b655ab49ef74069c0df2bcb0e1 SHA-1: 29e8901d8b96966d76b745b3285c0797a45e78f4 SHA-256: e7b70834de5ace7edd74c3301deea2b323084efa48f5b0a958bf5a82b169c3c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, and the PDF_URI heuristic points to an external URI. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=call+of+duty+black+ops+zombies+apk+android PDF link annotation
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/dilaner.pdfIn PDF document text
    • http://sro52.ru/uploads/files/61145202478.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/tipukafapujulata.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/bupakarajakovarosufaruv.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/56150161785.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wajekodakomizam.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/rizojub.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4a555778eb604cc160f478af7ef7cd32/78868223952.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/rukuwidofudakux.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/ronuzajetufusefa.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/22259152219.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/xogopobatabuveguf.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/gubof.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/55532631620.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/68667123364.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/70340212456.pdfIn PDF document text
    • http://geose.ru/userfiles/file/87021868129.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021911836374379.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/89413016103.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/ximagimoxuvolave.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7453eb66---kufikimu.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/18058604739.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/wosetomeg.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_off0000aee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 11320 bytes
SHA-256: fd6661759c60681a83da37031bfcf0634cc71733e556555f7ca47b8c581d4163
font_02_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 15808 bytes
SHA-256: 0065a61ac923324c8290feb329a280cf5a08ba686e94c689d3bf996f93503be7