Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed837b27bdda78b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 02:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4d510da15dfd9331b1834abf46644e82 SHA-1: c07f8a9222df37fb10c02f44d1b75415f96b67d5 SHA-256: 8ed837b27bdda78b2ce804150032a84a87ec9997a972d78333e945c03e20cb2a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=steps+of+solving+quadratic+equations+by+completing+the+square PDF link annotation
    • http://www.siposferenc.hu/html/49226586453.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jeriwaxavuju.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/wevizibasugi.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/55671452637.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/77986353943.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/99771521235.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/67848978462.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/fiviwapeb.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210909064515.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadd3abf7a---ridarorafivuginufipolug.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/bijanijetukanedoluwede.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/xagewevoxedatekisudofuf.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/zexonuvopubalutizatixot.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fezupugifu.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/90606595515.pdfIn PDF document text
    • https://mashura.co/userfiles/files/94892626755.pdfIn PDF document text
    • http://citranco.com/users/files/wibimagapexapa.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/lilibumekirogosiburoxibat.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/filidon.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/44581033564.pdfIn PDF document text
    • http://demkapi.com/resimler/files/ditebozalepesadej.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/wusemapesur.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/42794324486.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_off0000ceae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAE 11708 bytes
SHA-256: f75f643eeff687a1e661c1d7063042757b8f9989e8d85906f9a0c95c2cf20b0e
font_01_sfnt_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 18080 bytes
SHA-256: bddeea5c19203634bfd87f78500996b4ebc6a222feb506b4a923bbe4a82ab955

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