Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9616c4304e60499…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 12:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56e027f0f62957894527feb429a5e38a SHA-1: 8b760d19e2c283f15835eaba3ca7529f581b476b SHA-256: d9616c4304e60499f48f873e41419c9d7d461a0369b34676087815efd0a2b7a4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and small file size, designed to trick users into clicking a link. The presence of numerous external URIs, many hosted on disposable domains, further supports this. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, potentially for credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/vetewadaba.pdf In PDF document text
    • http://fullx.net/files/50298494597.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/loxuno.pdfIn PDF document text
    • http://szpk.hu/_user/file/29801533880.pdfIn PDF document text
    • https://aurorahoian.com/app/webroot/upload/files/puvavekedoweruve.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/fevaveziva.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/zemixumasodadijepis.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/89490325371.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/30431838414.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/45215959742.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/95910260261.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/danisumo.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/46060324543.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/vakusewebi.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/2858534301.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/67607120253.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/45949470457.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109111544472673.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141735c4afbb---sugow.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/pidinasud.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/67902188565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=steampunk+wallpaper+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_off0000ad05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD05 14680 bytes
SHA-256: ba9fe9dbba84bac73e3372e1a835e1e7dd7dd9d1955398dff4a140cf1ca3a6b3
font_01_sfnt_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 10736 bytes
SHA-256: 17bfd29347a8dae4dc9772a33f77198be3416e58a26fa0aa39029dd56c4c0763
font_02_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1