Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da38f5dc2595046…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 01:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ff086d2926c8c35adf1dcadb07d78ff SHA-1: c9cda2c587ca1d01536d7946b53c675892d28440 SHA-256: 3da38f5dc259504612dd36ed4327bd295311e050a79450cf9cd6f137401eab1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The `utm_term` parameter in one of the URLs indicates a potential tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=hacking+store+apk PDF link annotation
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/bogakukufoninokalemimeb.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/vawudos.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7a8a9dec---59937899485.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9279154815.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/minaxodorimuzojizuxur.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/rixelufoso.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/lirafapu.pdfIn PDF document text
    • http://www.celso.org/download/zekowokoxixavatodol.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39478286321.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/79867539977.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/bamadufe.pdfIn PDF document text
    • http://czyxchem.com/upload/files/45476488144.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/gamudaluzejefiv.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/48322509158.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/gurubomimodufo.pdfIn PDF document text
    • http://mamitobe.ru/files/file/83926637571.pdfIn PDF document text
    • http://charontrade.hu/data/file/62574935021.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/lanisalewunaxitug.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/33592334842.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/tezovonilubafekamese.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/wafugup.pdfIn PDF document text
    • https://12shio2.com/contents/files/powekuvezamoraga.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/41548839779.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/61978873207.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_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 10584 bytes
SHA-256: 012ace705d1d36c0d3bef92f8d9c9afe2c7bd0884c01dbc8e4b39ff91343849c
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 17952 bytes
SHA-256: 3b822a88dec6eb0333cfccac639fde4d316fd6c0a023902eadd2801dfac75d67