Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced871c5ce3cf280…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 10:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbc938e877052ba1e58133a7556789a0 SHA-1: 173f82623f2ac166ddc28ac71c68d7b7e6f44a75 SHA-256: ced871c5ce3cf280b4cf8a6fd95e4389b43b1c0def17eaa0ab284541a1698425
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a screenshot lure, indicating it's designed to trick users into interacting with embedded links. The document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing campaign. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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://congtydaihai.com/upload/files/94654005294.pdf In PDF document text
    • https://tahubunting1.com/contents/files/71019303776.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/27844819580.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/83047985505.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/nakeledobodubakumimiv.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/67294460544.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615180b386530---53572204734.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/57992629187.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fda6b27c3b---51614038883.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/tejamunukiloxo.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/27526017610.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613DEB87E362B.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/41669490113.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/wutefobilegogoxolonunokil.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/xenoxulasija.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/sezusuk.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/dumemowadugubifefu.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/39296670826.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/jexibapeb.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/3438816551.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/99248670841.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-8/20210908092129123697.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bedila.pdfIn PDF document text
    • http://mutitar.com/user_img/files/31084935553.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/dumotexuzarisiwaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ww2k20+game+download+for+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_off0000af2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73D 14456 bytes
SHA-256: f3985b3beaeca4ed8709b8f368c871f63add64a8874aec8fb0ba3d2571dc8a98
font_02_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 10844 bytes
SHA-256: 5c4c5c5c7b73331de96a291a66cb76a788cdbe9b44748f40053cd7b696fccd77