Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99edd139f9e6aae…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 01:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e29700d73ced1fa1f727bdc908443105 SHA-1: 20ade187c37b195794d54ba8bfc1e65da2139107 SHA-256: a99edd139f9e6aaeba3d91db26cfb356918e569d85e7c9ea0fc9c3e17c53ab42
146 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs pointing to external websites, many of which are hosted on disposable domains and utilize UTM parameters, indicative of a phishing or malware distribution campaign. The presence of external URIs and the overall detection as a trojan suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=avpu+first+aid PDF link annotation
    • http://lpkgoodframeupvc.com/userfiles/files/gofutelajezedi.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/jaxevuximexogo.pdfPDF link annotation
    • http://bsa-billiard.by/images_from_html_editor/file/surolaragegexisa.pdfIn PDF document text
    • http://dobermanncz.eu/files/3865826613.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/99214797192.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/87620757748.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/falotomovemogapatinuson.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/54397650402.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219102052236319.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/rokobinelemep.pdfIn PDF document text
    • https://autoskola-scp.com/files/wadelulas.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/nuvoma.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/30442972047.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/11206630194.pdfIn PDF document text
    • http://apothepharma.com/upload/files/94159962021.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/12641253234.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/65071430563.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/51681098283.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/tozabigokinoj.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/pemakozoxok.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/89024450018.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613570c592d42---24227166289.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/35322755357.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/peniradufof.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/44163075025.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_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 18632 bytes
SHA-256: 0141a647bcc541cd762b21528de4e6d7268ab30bf1a38d0e00db5b969c75737d
font_02_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 10236 bytes
SHA-256: 6a43bcdbf8281b5462d6b84b1b4daa606665405e3bd15cb3bb0a295b2be9faf5