Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c97d0888dc3213…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 07:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 62407db113382cb5c903f0b40b6fc63f SHA-1: 00b71bb8c7695bea1a110f9b561d7a0a753d901a SHA-256: c8c97d0888dc32133c46e6b1f0f873ec01b7803732226c606f1a93b61db0d9df
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links, many pointing to disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery. No scripts were extracted, but the PDF structure itself suggests a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://mimpishio2.com/contents/files/forajubupegub.pdf In PDF document text
    • http://grafiport.com/userfiles/file/xofumaluguximen.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/takupitenupobepexamiwupe.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/bumage.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/ripudusid.pdfIn PDF document text
    • https://menu2uplus.com/images/file/82722775949.pdfIn PDF document text
    • https://gyepracs.budvill.hu/userfiles/files/22118979876.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/07a2b3e3a2409ad9b71579bccdc37359/28703422113.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///wugosefu.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/nonulijimodalo.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/lawelenuled.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/67311655885.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/6572525708.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/viwusovowafepiwevumo.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/91852884512.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/tojekukaximesisezez.pdfIn PDF document text
    • http://c-amc.com/upload/files/dejal.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/mojefagesilukozevezukaso.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/41226464505.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/fimadivi.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/5427540901.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/wuzali.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/7414910850.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/k8g8ebcr6f7qnpb8uhvtbrdvka/folopumipofu.pdfIn PDF document text
    • http://vswet.ru/f/29822395332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+1+turbo+starsPDF 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_off0000b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 14312 bytes
SHA-256: 9d2f8eb7a9302dd4a2810171e1f634a0d07822a69dfb2a70094d81b7f3b3cc0b
font_01_sfnt_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 10336 bytes
SHA-256: dceb65c3a6872b8f4e483df1d164ea388dbb8570fee8d6edac63fa54359eb362