Malicious PDF — malware analysis report

Static analysis result for SHA-256 513ed8ae231b19f6…

MALICIOUS

PDF

87.1 KB Created: 2021-09-09 00:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d05b1d2c311fcb94febacba94e67f9fd SHA-1: 559e818e5020f2b39a4e4e9f0d602290a674ffb6 SHA-256: 513ed8ae231b19f6565bee75a723c397590153e22d598516058b130d6130c89a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to PDF files hosted on various domains, suggesting a link farm or content distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results or distribute malicious content. No scripts were extracted, but the overall structure points to a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://shmgec.com/Uploadfiles/files/wutojevukadav.pdf In PDF document text
    • http://vizugy.hu/uploads/files/52963036828.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/keludotanotupel.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210905161352.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/84639965540.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/muwotuse.pdfIn PDF document text
    • http://krupongs.com/images/file/kosavereruva.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/59432082640.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/89079257593.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/jupifekowi.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/79720824501.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/refatulasimil.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161356d9022dba---kalesujizidewokikamamu.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/3156680935.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/54691770357.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/nepexabejap.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/xifaremupejavo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355bd65af44---9880765753.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/2148755926.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/2622927733.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/90627585449.pdfIn PDF document text
    • http://centrons.com/uploaded/file/8023206761363f7940d6a.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/dofap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=4k+iptv+listPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 19164 bytes
SHA-256: 01b239ae5f316764e0ce68587fbb5a5a47761d95f8ad6f8f85af9b83ce6a20b2
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 9768 bytes
SHA-256: 0144fa48a01fe0bba20052a19dfcf2d9c9bc51db042acca15b0e3c460a29f132
font_03_sfnt_off000133d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D1 17708 bytes
SHA-256: df4f1d26407b196839cea4c4340ccdfbdc14fad5dcfceb164b78047e3a19f8b7