Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfeceff8f21d4899…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 09:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 634fdb585f50b7c9670e6f2db926f3ed SHA-1: 4d5c8b9ae1814029bde71652645139eca9b17789 SHA-256: cfeceff8f21d489937ef395eb547b85325a6d8163fd0fe7635b897d39e747e5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to other PDF files hosted on various domains, characteristic of a link farm designed to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9816

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 http://aptekarynek.pl/zdjecia/fck/file/48191526331.pdf In PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/sokamexip.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359581e2afa---titivijej.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/dadebafitomeligozu.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/36921760271.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/ripuzasixokasufozun.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/kevojevoseveto.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/19874269617.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/45171535703.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/97559944223.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed0139f414---safivogonoroxijixafe.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/danemudasatasin.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/44791555236.pdfIn PDF document text
    • http://homeopathyhk.com/files/boviweladazapofe.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/24871256648.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/letedav.pdfIn PDF document text
    • http://stonebreaker.at/lupalirum.pdfIn PDF document text
    • https://somogyplusz.hu/files/letukaxebedajudikogobi.pdfIn PDF document text
    • http://vladekoservis.ru/files/83609689791.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/78593468549.pdfIn PDF document text
    • https://taperagi.com/contents/files/87557598700.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/fosexatawidetavovifumesas.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/bazumibiduzanapib.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/najapojonawunisa.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/pulonuvusobuvogilojovawep.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/488496064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sanam+teri+kasam+full+movie+download+360pPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 20316 bytes
SHA-256: 0d1dc7779bc494a20a9fea11d4a6bf653f507e122c18651e8380fd18c7552041
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 11540 bytes
SHA-256: a782e25ac1f0570642b2cad9585251bd80c77faf6bbbcbcae6c7672e3720d212
font_03_sfnt_off000133b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1