Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7572c08f7bf3f39…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 15:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4182feb2df037a3bbf75da4e08165579 SHA-1: d63f21ee61b8ee5b715acd5a2152e6306d531aa3 SHA-256: b7572c08f7bf3f3929689f309c042cc4b3daefc785c743d4ef88782ff2436321
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://espritgt.com/userfiles/file/35102964743.pdf In PDF document text
    • http://naosgym.com/userfiles/files/vizitufitosewotige.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/2671334969.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/43452459638.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0ae5c1c50---20743459312.pdfIn PDF document text
    • https://bunianco.com/other_files/File/93184187999.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/17641404891.pdfIn PDF document text
    • http://armanetti.com/images/xopawebepufikevasa.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/28370244239.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/9637975502.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/1057525351.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/6454812612.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/66959699381.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/48134474312.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/xeret.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/kujatobibujutagijupig.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/giforapikafeje.pdfIn PDF document text
    • http://360global.ca/userfiles/file/62149298330.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/navetoko.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/pirexilotokakit.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/64912829407.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/34ed655dfcf183248f9e39eef627b1ec/mepomatatokived.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/4064573518.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/61010349516.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/wowuwa.pdfIn PDF document text
    • http://wwsm-us.com/files/file/wilifarop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=positive+adjective+that+starts+with+rPDF 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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 10600 bytes
SHA-256: e57ae9fe188c6da1dec30973a011b140c93a38312b5ed945f3d513aee20cd8c7
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 16752 bytes
SHA-256: 6d3203a88e8a97ef9c5d4c0ad00633ceeab145e200f87863c0a787ff8f0f9bea