Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d71e96c580f869…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 05:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09c99fe5ab8349b21d40088f1f113545 SHA-1: 0456dcccff69ce7fdc5965b8033a1294ca65441e SHA-256: 46d71e96c580f8696732a5edaf4689c1aedf691b2c222e6abc6c9af0959b7d07
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to PDF files on distinct hosts, suggests a link farm designed for SEO manipulation or to distribute further malware. One URL, 'https://abicecream.ru/ckfinder/userfiles/files/jebitodowon.pdf', is particularly suspicious due to its structure and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://abicecream.ru/ckfinder/userfiles/files/jebitodowon.pdf In PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/93005594704.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/rexawe.pdfIn PDF document text
    • http://erpos.sk/data/files/gapum.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/86125466771.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/aa055a13463835bf82660ad7a8588b23/7068544854.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/noxerimomej.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/jisivuwanuvonumogosaf.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/wuxegatemekofagofo.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/kajesal.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/jopilemowilopixuzowewasat.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/sasalonexinobaxefi.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vopefibomuruwafuxosinumo.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/lasofofadasatawo.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/2649596677.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/kukutolosimamimajemetuto.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631507424.pdfIn PDF document text
    • http://www.polni.si/Images/files/34780405585.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/65776903862.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330f37cb1a3---73424010042.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/63919280731.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/zozopulugeva.pdfIn PDF document text
    • http://imbirimbir.ru/files/31128566244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=snaptube+apk+for+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 17600 bytes
SHA-256: 682fc13127090fdbe09bf26e433a8fa662396e24d68707cd70d016c03e65b26d
font_01_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 16404 bytes
SHA-256: 21ca7d07524b5d8e60f703599f8f9b0f4a70ffcebd1ca8badcc33241a55115c2
font_03_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 10684 bytes
SHA-256: 1921a33d97a8fce9157b8ba03ed3004b5467cee4a746f073260b06759cf6dd87