Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebd6f60887379a6…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 09:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 252d16b75ebcdaa8b2951a843520cf61 SHA-1: 61407c6218367afdb2b1af8b7bf3bb51dc50b983 SHA-256: aebd6f60887379a6e46a60a142c9b270a74b954e35b700cda82e6a58b816d3b4
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and forming a link farm, suggests a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the deceptive nature of the embedded links, likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mh-gartengestaltung.de/userfiles/file/64173346332.pdf In PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/49939344881.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/16827640799.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/7940264497.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/23718804322.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/83137586385.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/ligakavirizifimuwitojufi.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/68823905839.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mewivusogetojubevopof.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210913_223354.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/22226620010.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/dumivotazemilitakabeda.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210912_F6F4023B3055725C.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/jufol.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/2864223980.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/86924856065.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/49513971329.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/fuwadotewok.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/18086752894.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/duwarem.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614435a75ffd9---kuzifajigataw.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614239d664579---97189602084.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///wizakiwasi.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/bibex.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/vebogiruburuwujuzaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+auto+voice+commands+not+workingPDF 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_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 10992 bytes
SHA-256: f835e9c2478fe9093f83b1ead960b461a56c44bb8853ff1806d8e571f88b9f35
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 18200 bytes
SHA-256: 58e0f1d49678d58d9731f1db7368a83f175393825decccf9412eb80953e79dfd