Malicious PDF — malware analysis report

Static analysis result for SHA-256 80475bd647a6c1c9…

MALICIOUS

PDF

93.5 KB Created: 2021-09-21 18:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a694a83425f5f5a922d90b7b39d96685 SHA-1: 2a1b962172e89efac9b115c24bb5d3fcc10b6f42 SHA-256: 80475bd647a6c1c98f7aac640faf4eb788174bae12b4649ad71439dfbc0ff764
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with many pointing to disposable domains and structured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm with a 'utm_term_redirector=True' heuristic further supports the classification as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://mmeasar.com/mmeasarfiles/file/kolomutekopaxepabav.pdf In PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/kutaxawukakizi.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/38327512120.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/vesugifev.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fimufageti.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mufexo.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/85582673242.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cc8af4005---vareliwu.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/94759017455.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/55752049994.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/55424950459.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210917000333.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/podomuvufanewerilorezunak.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/jebiguzalo.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/3155555595.pdfIn PDF document text
    • http://vejwun.cz/images/lopubopen.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/10939034949.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/75370589599.pdfIn PDF document text
    • http://kachelofen-prommegger.at/fovumokurinug.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134af1c76617---jatoroxavi.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/nevorerakutarajir.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/gotubukifuxadanewogirija.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/sopatixufabewikive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gry+mmo+na+androidPDF 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_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 17944 bytes
SHA-256: ea55b504ee2dae6d2913b4f7f99f69f8caa41d991fb14ca0732a166e57b3cb3e
font_01_sfnt_off000139bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BF 10116 bytes
SHA-256: 305a4f7dde128e5e52eccde07f758731537429afa45cdf851ce168435c422bc1
font_02_sfnt_off00015042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1