Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe37579ed2055bb…

MALICIOUS

PDF

84.7 KB Created: 2021-10-05 06:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bdac03e196051991b18102f235d36ec0 SHA-1: 95900cc2843a5481182e8acf4d0941c2cb3c1db9 SHA-256: abe37579ed2055bb1c536c2e917e88fe602464efbcf34ff75e70268d4c225e28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the use of a link farm on disposable hosting, with numerous embedded URLs directing to potentially malicious content. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ttmplus.com/userfiles/files/38957790155.pdf In PDF document text
    • http://preiss.at/upload_files/files/65213472545.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320bf27a988---5179362515.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/62252438047.pdfIn PDF document text
    • https://pellevah.com/upload/files/bovipajo.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/bijavin.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153eaf98c955---62789615707.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/27276435224.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/79330205538.pdfIn PDF document text
    • http://kccmaul.com/files/files/xejuzowabevaziren.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/44102806859.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/69432674950.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/lofebofevasijub.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/losot.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210904175101323.pdfIn PDF document text
    • https://sanagustin.cl/files/47273138774.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/todiwixaz.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/70527062687.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/99627474016.pdfIn PDF document text
    • http://no1sushinroll.com/uploads/files/gejexusejivezaxek.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/64807351055.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/22751691864.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021925213248951.pdfIn PDF document text
    • http://chromoink.com/updates/file/51531101093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=my+bestie+and+your+bestie+sit+down+by+the+firePDF 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_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 22348 bytes
SHA-256: b62d2b97f54d932e82c095e308926bd49d9bc5aaa0f36f193c668d3942a44ada
font_01_sfnt_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 10840 bytes
SHA-256: 6040d0f8576109522a2711c3f737b57d8234bff2793398ffbdad4ab74515c48e
font_02_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1