Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39e53ff490f3d25…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 17:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc950a56b517cd9a188b88520e07aef9 SHA-1: a3f0d3da1e437903a25c2c128cbf38632b23d1ac SHA-256: c39e53ff490f3d257eb1949d9e4b370524ee36671a6e5849deb240ed77085a24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The presence of numerous external URLs, including one with a 'reset samsung galaxy s3 mini' UTM term, suggests a phishing or credential harvesting attempt. No scripts were extracted, but the PDF structure itself is likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=reset+samsung+galaxy+s3+mini PDF link annotation
    • http://gmkms.net/upfile_editor/2021/files/sozebevefijosobogijisale.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/bivuna.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/sufimeze.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/nezatinanijiniguteg.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/wobilatetedujibezezam.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/63624563965.pdfIn PDF document text
    • https://losungversorger.com/product/file/wobukupoxasemo.pdfIn PDF document text
    • http://ilkemymm.com/image/files/89975485121.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/61067133586.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/wabugamedobaxirogatizosip.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-10/1bfd0eda07a9558d0ccbe66e921b316d.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/muxizokurusumudowodom.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/64684724443.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090519453773499.pdfIn PDF document text
    • https://heyratacademy.ir/file/metipitafelepazew.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16140eee77bafc---sebidur.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0be637d8---51963717557.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/4732260582.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/5399445989.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/gonakomir.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/99429392110.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/tuvudavegosamizamaguluvox.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/denoxozedivamokuti.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/sofenagi.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/1294654579.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_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 17764 bytes
SHA-256: baf93dc184459720c1fad839dab41bd03ccc9853ff72dca46ac3d66d61371758
font_01_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 10764 bytes
SHA-256: fa1e8cd0318ea24b07a738662b5f873195e645a730a7a8a06164b06126aa257a