Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0a22009e91e545…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 18:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c1a4a9c9ab5b2e03583fd8da2ef787b SHA-1: e0f5ec5a5f513c95b472a6ce96955f04769a8076 SHA-256: 7b0a22009e91e5451cf764c6f498f2f9b112057dcfce45b36298420d25dc6cc5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links pointing to various PDF files, characteristic of a link farm designed to obscure malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to malicious content, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://autosoftware.company/autoresponders_images/files/dupomanu.pdf In PDF document text
    • http://flooroverstock.com/admin/userfiles/file/zuvuduzaganu.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/sisiraworuva.pdfIn PDF document text
    • https://inarsindbari.org/uploads/87165479876.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/disavo.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210908052905.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/27068683823.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/8839622680.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613880bc756a2---xoxetapizot.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/12105536695.pdfIn PDF document text
    • https://gornjastubica.hr/files/difubasusadopo.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/28013694096.pdfIn PDF document text
    • http://yjccnc.com/upload/files/37442892810.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/razavewikabobejeledudo.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/sejevuke.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/sakobeluxiforitivadev.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/42820485098.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/64478327041.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161314df9b0939---21713742677.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/zezipujesixomeku.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/fuzimejupep.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/49804065371.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/49918861434.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/vokupaturato.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/1100469977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wrestling+revolution+3d+networkPDF 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_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 10772 bytes
SHA-256: bdd0373c021d436c826b0ef68a5bfa61d2427a34e7a0263c0d8c00904bb94055
font_02_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 18056 bytes
SHA-256: cec664fad11f2cd803d84fc2814d15b29c718f3a2d1446338623c8548f688ff0