Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47a172490418b82…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 04:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51cbcd46804fa404a81487fc51b4915e SHA-1: a8b814003da69ed498b4ce17a03b44618d0f517a SHA-256: d47a172490418b824ec4fe2fba82647fa69943d128bf64adbb5e69b6445d5fb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, but the heuristics indicate the primary function is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=first+aid+stop+acronym PDF link annotation
    • http://tid.vn/upload/files/kejiradufuse.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/zafujeko.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/23176157966.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aab8ffae746fdd77cc73261d60169c70/51601418345.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135496e3c841---gisik.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/zekuvasofol.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021911202423.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/1466972940.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/16528183962.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/jofixad.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/27780046380.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/takituvuzewefax.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109051421006291.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/78577080997.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/rukomanikitololafagej.pdfIn PDF document text
    • https://best-label.com/upload/files/33445275639.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/86747224301.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/vutigifaxilila.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/tatovogimexebunamupo.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/78335846157.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/54031539510.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109021205105371.pdfIn PDF document text
    • http://itena.si/uporabnik/file/59443560180.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_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 10588 bytes
SHA-256: 202dbe2679578eff96208b6bbdbbebf2c223ceb1f9d8e328daa9a47fbec50169
font_01_sfnt_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 16644 bytes
SHA-256: 44f7ceb081c52b07238150bf9186a7226cc6b4206e871cb3d76b5943f0ac4eef
font_02_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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