Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15c115ebc46de29…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 08:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 34dbd19ed9b522736d3f322dbc3fa42b SHA-1: 8bcb8de77974530f27227d9eb1a09f9a77eada76 SHA-256: c15c115ebc46de29abac4cfcc0949a58fbc4b6c6198217cb9915fdfffe3f0c44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=jazz+band+pdf PDF link annotation
    • https://bursac.net/userfiles/file/kuwaseziwuvu.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/fidagileve.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/93772590233.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/xogisixumuxatil.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/kiroxizujesanemod.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/42985630450.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/95594522014.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xezosoboxaxo.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/luxofapavuge.pdfIn PDF document text
    • http://webbuilders.com/files/file/1937051459.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/xuvumulapogegomiremudo.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/wavakijajakalorozupir.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/tupefosorowatofo.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/60469376602.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/80894464541.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///55295576640.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/detefitekarojumunitipo.pdfIn PDF document text
    • https://majubesar.info/contents/files/fotorilokofav.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/57516635817.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/wolezetenigubotona.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/votuwagawijusetadixa.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16315223161602450409.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_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 15292 bytes
SHA-256: 7d06d2dda031bb8bfca9e2cea324999462a052f653129da27e3fe2bfca09021b
font_01_sfnt_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 9928 bytes
SHA-256: cc69778b549cb97e4533399adef0223c698a0414ae91fe3cf9ebf4ee54ddb8a5
font_02_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.