Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a1a5b406aafc5c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 13:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60b4253ca17c8f63f73bab7a43a2c31e SHA-1: a8c56e0db5cfef15a1166edbffca7dc132b61d0d SHA-256: 27a1a5b406aafc5c4c775690b44784321d566054a6d090a7b40270ad472b0acd
166 Risk Score

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a remote support tool lure. It contains numerous embedded URLs, including one pointing to 'chcial.ru', which is likely part of a phishing or malware distribution campaign. The document's structure and numerous links suggest it functions as a link farm to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://chcial.ru/uplcv?utm_term=windows+remote+desktop+app+android PDF link annotation
    • http://onthebroadway.com/CPD/adminpanel/upload/file/32411772513.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5751810a1287ec911b8817c43e2c0212/2805624044.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/14718380905.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/modutetatimejiwinero.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/kogupenusuvopimexatire.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/99241959716.pdfIn PDF document text
    • http://elskenecologie.nl/files/91488221422.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab1e9dfaa---tomiditutalirulo.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/82967923800.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/vadutiberokifinubifijeb.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/85973269177.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/76112425076.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/gulatexijupegizigedome.pdfIn PDF document text
    • https://protum.se/file/38015556613.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/1913206624.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/21593473969.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/wuvagupiduripejusuzufesuv.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/benab.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/55604363329.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/keduwanitorageduw.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/71165009928.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907022127657053.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_off0000c1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 10680 bytes
SHA-256: 679e5a6ddb6920fac5e8150b37fbb45e63710df14d3252eac0e8ba19816a73bc
font_01_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 17428 bytes
SHA-256: 57155986466211096e9088fae0071c1778f9bec6c5df524501602beb4a540718

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