Malicious PDF — malware analysis report

Static analysis result for SHA-256 a697abdcb3dcb7cb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-24 00:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1bf1c58709dc89e7ff1b7f9799501e90 SHA-1: b65ea482fc680db66c68472601ae4c1871527fb5 SHA-256: a697abdcb3dcb7cb3d16ded97cd45aaa06b899549f3a85dfd0db37a9d18a38c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, likely to distribute malicious content or phish for information. The presence of embedded URLs and a 'download button' lure further supports a malicious intent, possibly involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://mk-sito.it/uploads/file/72973947754.pdf In PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/4952675233.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe233fa1e---28310957732.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/91369832929.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/85889412385.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/46468299819.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/rakajozoneki.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/tubuzakirolakesaregetub.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/73549648287.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614403832708f---gexovejebaratinofoxokoso.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/wubarulimukifesero.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/15582594527.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/baxesibizomunoteri.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/31104229531.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/28703277848.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/6737356405.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wuxidi.pdfIn PDF document text
    • https://ienter.bg/files/dobulaketiwolit.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/88321772258.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/gareridowiximuxezi.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632243350.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/25295128685.pdfIn PDF document text
    • https://jin-ji.com/upload/files/60662671286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=movie+43+watch+online+123moviesPDF 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_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 10964 bytes
SHA-256: 1aecb08c09f4b2bdfa54069cfc6c974171118264018aec78806f2f40dadf2d75
font_02_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 17892 bytes
SHA-256: 7a5923c7b5c5794ee6993e9daabe9660b889104e61f4de15addf92620bd8407b