Malicious PDF — malware analysis report

Static analysis result for SHA-256 566d5497561b4734…

MALICIOUS

PDF

86.4 KB Created: 2021-09-21 10:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e1ef8353e902c319a269fc4117c62a5f SHA-1: 230ef66a0b4c0597b91d8402f510a20acfd3190e SHA-256: 566d5497561b4734965dbdfd9d92d50fe2a068f0460cacf66d68bea288ac8143
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the presence of many unknown URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dortmundpools.com/contents/files/21384161886.pdf In PDF document text
    • http://hongdanhaudio.com/luutru/files/40200374466.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/tukezowawavapadovotimu.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/73760201521.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/wepojigatugo.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/padosanemufije.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/071345381803.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/76396161918.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/bimiruzata.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/83004928216.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/medik.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/30539129438.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/77306676245.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4dc31cc39e6e140934fca8f76305d96c/54139556288.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/75040072801.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/20443306261460685a1779.pdfIn PDF document text
    • http://baove247.org/upload/files/23922354915.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/janozazoto.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/sogaxizid.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/31558994496.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/sasipuk.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/perorujijomesazupo.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/65559668366.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/6695124757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mangaman+app+androidPDF 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_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 17392 bytes
SHA-256: c1d062aef05cfbc32f7858f790c529912615c8a481058bf59b67e534a190363b
font_01_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 10284 bytes
SHA-256: 7df37adfef7ce5b2396b783a207b1665bb6ac1d736faa4307f6a3ac53da46db1
font_02_sfnt_off0001343d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1