Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f23bf6e5f6443f9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 09:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea112ef5b3edea214482b238cce05d38 SHA-1: e4cda9f6018300fcd93f375c124bc2bce38c67b3 SHA-256: 1f23bf6e5f6443f959f6ed04934be8b6ed4a877879791626b69464adfc85dcaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=how+to+set+my+ringtone+on+my+phone PDF link annotation
    • https://ecoledesgourmets.com/userfiles/file/vowawiromevuruvibosezo.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/kaseguz.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/bizutusisideti.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/dofusifavatogadat.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/61939840197.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/baberowifabazotikurile.pdfIn PDF document text
    • https://phuquiland.com/upload/files/77845834457.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/taxagogokatexux.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/fapebiripedomivenadikuz.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210907_235057.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/33867972550.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/41450177441.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/76365359776.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c87827c9---2344445891.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/kafadudofosibovoxasotivam.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/99210952319.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/luwev.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jeturom.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210906_A65B9CD28CBB8944.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/papewuvivemutizuloripel.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/50932761700.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/51074443087.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/nibedufitutofe.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_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 10684 bytes
SHA-256: 2da6e24fa008d261e574532cdc9af5235513309854d5d8a529bfe6dd49aecc0b
font_02_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 16684 bytes
SHA-256: 181fefda3d7486f9c322c29f78ca0214d2557ba17cebf92dee4b3c45b4dbeaea