Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8c80ccec92410f…

MALICIOUS

PDF

98.4 KB Created: 2021-09-14 02:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64e54910fafe4e402ac0e7d28ad1ac55 SHA-1: 5f29ada8d9974837275d53c5c8a084936ee68f0c SHA-256: fb8c80ccec92410f6803a5a09c62a56e13fd6032b54343ff506046c7a2fc4e9a
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The embedded URLs and the PDF's structure suggest an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://speedwayinfo.hu/uploads/file/53633031319.pdf In PDF document text
    • http://ventss.ru/userfiles/files/migesexuwidibe.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/fimawagoluxokupituza.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/27257172102.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/7418055373.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/64707651832.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/38737378721.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/galexoxavexepumibuzitobe.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/foberobawim.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/namapikufoxavub.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/88638977320.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1728daa60---pefekagebubifosijibi.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/fejomavirazexi.pdfIn PDF document text
    • https://onecre.com/images/content/files/9200034537.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/27070373622.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/46919298000.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f271aae84---4143218538.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/4942155654.pdfIn PDF document text
    • https://eclearusa.com/images/file/13914332423.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/solarukurudowez.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/ludixer.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/wudew.pdfIn PDF document text
    • http://webs123.com/userfiles/file/3224845382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=123movies+stand+by+mePDF 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_off000115fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 19964 bytes
SHA-256: b68fc3a219299402221ed5d9636dfc615c2dc0a7af9b13af2fa8559f4629f776
font_01_sfnt_off00014abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABE 10828 bytes
SHA-256: 49b499937703aec235c2ce8affd3db75965425cce4c8cfe522399ad70d0f3d8e
font_02_sfnt_off000163d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1