Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacd1d7eeb51681a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 04:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 417b14e5f00fa93cb37fc864b31e2b59 SHA-1: 31e333fb5277e36549753155759cae6cb129b636 SHA-256: eacd1d7eeb51681a8f6a25839ebd71f508a96f275ffb9ab254bdc22edcca717e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://richmore.kr/uploadfile/fckeditor/file/dupovonotuzifu.pdf In PDF document text
    • http://lenosada.sk/editor_uploads/files/kogulurufojepirazux.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4da2e141---vowamitovev.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/60806784319.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bebe0809---54240364833.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/mulofofufobo.pdfIn PDF document text
    • http://www.buildonhope.org/file/74586585063.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/83870387387.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/28343353435.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/paxupuvigajagegikesape.pdfIn PDF document text
    • https://bauarch.bg/files/67481777109.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48582047630.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/buxozukubafojifitoxelolun.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/befufekogiwanuzakerimo.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/napekifabuzuwawo.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210907124743_0sy9xb.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/tevidukatoxigenubopa.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/venolejonarevokev.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/94499642505.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///gagojokalomif.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/8652109757.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/91800925422.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/91872063647.pdfIn PDF document text
    • http://ellev.fr/upload/files/nekaligegaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+unlock+android+phone+pattern+lock+if+forgotten+samsungPDF 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_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 16104 bytes
SHA-256: 723192d3a19383239725f9392d19aa4c1ed4a7dac8b781e4e942b98d2be83611
font_01_sfnt_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 11336 bytes
SHA-256: 6156f13a32c1dd79365d646685d699700cebc7cf2282d9546bc0f4dc1eeea8a5