Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9c4432560a6409…

MALICIOUS

PDF

74.5 KB Created: 2021-09-27 01:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 368f5589c5ad4e5596db0f03e557c521 SHA-1: 3bcc3acc067df1437e4a27bb82b82545edebfe98 SHA-256: 6c9c4432560a6409d0e71812112f33da52c023985b8d0578cb5e0ee0ce75135d
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristic firings indicating malicious intent, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS classification. The embedded URLs suggest a lure to download a secondary payload, likely a Trojan or phishing component, as indicated by the ClamAV detection. The sample's structure and numerous links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16134a98b6a014---72736344134.pdf In PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/44465942377.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/68316607044.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/40131383433.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/61996356627.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/13394264337.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/91771503377.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/mutisotakikunojirasumeza.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/vunigarola.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/70820162949.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/40538408645.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/donuxetaboweki.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/98089168440.pdfIn PDF document text
    • http://hidropro.hu/upload/60243500870.pdfIn PDF document text
    • http://c-amc.com/upload/files/31220005448.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/worerotimemipik.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/pajafebuzidebofafi.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210925025733.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/56185483114.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sesozuxaf.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/4263219101.pdfIn PDF document text
    • https://kiptep.ru/file/96435846978.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b174e73008---62752529803.pdfIn PDF document text
    • http://rubensova16.cz/files/file/tosuwov.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/41165913433.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jivusubosaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wolf+of+wall+street+full+movie+watch+onlinePDF 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_off0000bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 10844 bytes
SHA-256: dd20f553b9de87e3745d2502698ff7ae915cdd77a4a63299955e67c9f88068d4
font_02_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 18244 bytes
SHA-256: 50c8c46db05de398ea4dc99334dcca245796a31729590d86caa8f9cfca57a1a2