Malicious PDF — malware analysis report

Static analysis result for SHA-256 18871af498af17fe…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 15:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13711a88222b584f94f1beaefa5ac2db SHA-1: 9b3f41f6bb093d68a1da23e1dcfa32b649910e74 SHA-256: 18871af498af17fe7dbe569c703cdcd4ac5d68b3b5382f3556ea7664b9c115ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, many pointing to potentially disposable domains, suggesting a phishing or spam campaign designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://foodphotoshop.com/userfiles/files/gerokibepesanowazezet.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139d306bf918---8841978688.pdfIn PDF document text
    • http://erimti.com/userfiles/file/88615390710.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/71728040316.pdfIn PDF document text
    • http://df-2.de/images/daten/file/nimakokem.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/71261503533.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/dujinexofigep.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/viladar.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/xupaketixixonaxafepekujid.pdfIn PDF document text
    • http://e-district.org/userfiles/file/pukosejuxusewatewul.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142c24673d6f---37862772624.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/mudemiro.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/36370634185.pdfIn PDF document text
    • https://ms02bet.com/contents/files/rakezutebonol.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/wowovimapinakatipi.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/3631506553.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zetawafekubejoju.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/12492113576.pdfIn PDF document text
    • http://vit-physio.de/file/24268480298.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/tozis.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/sogukupazumutefuni.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/pudajovezegefodile.pdfIn PDF document text
    • https://riwg.in/userfiles/file/buxuzozamafabuvokeronut.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/konugeb.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/ragilomegovesonuvil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+remove+chrome+from+my+phonePDF 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_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 10668 bytes
SHA-256: d188d9deda21380355786ca9e1968e1b5e5f00b4962cad75e5aa63253b64d3aa
font_02_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 17568 bytes
SHA-256: 4e10e523092774654ec930a7d79f59aab707eb816a4600855ffb64a7c223d0f0