Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acc13de5800425f…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 13:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 89620ed9eb82633e386a3ec2527ddc85 SHA-1: 987a58ca45bd2937b957273ceef01024897e2275 SHA-256: 3acc13de5800425fbb1fda46effc31cea543a24fe4bb72452646aeb042d08180
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as an image-only lure, typical for phishing campaigns. It contains numerous external URIs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 67 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 http://labsshop.com/d/files/kafilusixa.pdf In PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/34790802470.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/81983743789.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/kowajasifumamisotarigoke.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/8962697821.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210913085959.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/51293157760.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/36405321729.pdfIn PDF document text
    • https://stauber.lt/images/files/milimetek.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/4e058947b5fb1902b158627feed81695/85308732297.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/nedajexexutelulozelevifaz.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/14916817074.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/wojete.pdfIn PDF document text
    • http://status.cz/UserFiles/File/4183223067.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/karawetawixafanojivas.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/nudofadixitikegasitevutu.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/zosilufuzabivu.pdfIn PDF document text
    • http://twilaw.com/files/files/66034538310.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/zexedemedividuxi.pdfIn PDF document text
    • http://ministerium.pt/files/2705217420.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/viwune.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/93284108589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=boku+no+hero+academia+heroes+rising+release+datePDF 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_off0000ad7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 13744 bytes
SHA-256: 87c68fb54e935bbab06c871116b4f097b32d3d7249e71e08ea236187101752ff
font_02_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 11060 bytes
SHA-256: 5f5076bb7b4b1933b37c586288a96187c5056bdb4d386b996e0eee357af08cc2