Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc573ffc670d822f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 03:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c471dfbdc3b13046be27fdf77065ba9 SHA-1: a1419b823baadf4e6759b82bc34be696573837ce SHA-256: cc573ffc670d822f697fb2b84e835a806a2f1092a4452071864417987085de2a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, acting as a link farm, with one specific URL containing 'grindr xtra hack android apk' in its UTM parameters, suggesting a phishing or malware distribution lure. The presence of AcroForm button actions further supports the interactive nature of the malicious content.

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
  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://ketchas.ru/uplcv?utm_term=grindr+xtra+hack+android+apk PDF link annotation
    • http://stilistspb.online/public/files/uploads/files/metuvovolimeloluzalage.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/diduwubi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/70704906102.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/jutosikos.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/92231338785.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/65663827137.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/4995755925.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630728633_05f94d56ca.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/padumukixenulol.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/31735083729.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/60381126566.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/rurijaxupejokisamedizul.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/dejoke.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/50573793447.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/besiluminoboxaxoz.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/fajiroluxenuleruliga.pdfIn PDF document text
    • http://soc-in.com/data/media/files/80988091689.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/89685673891.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/tijejotefiwedurusa.pdfIn PDF document text
    • http://taigesw.com/upload/files/74931225988.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/xutezadevefitur.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/25443268929.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/55580143605.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/23183643644.pdfIn PDF document text
    • 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_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 10496 bytes
SHA-256: 168bc2a3f43068dcb1fea062a89154eb86dcab8638a839100925092e63f511ec
font_01_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 19932 bytes
SHA-256: cfbe556db673e8854bd85b830ce7cc6878306152deb69eec7338324bbd49b6c6
font_02_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1