Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb061ec695e9914b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 14:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db3fc34916132e3d72eabfec0e6f6ce7 SHA-1: e0804d59ac22a3c4b17fb93155ed1b2dc8da7aff SHA-256: bb061ec695e9914b0ffbd39dfc3630d28e15c249f7160b8e5528ea65c81631a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The presence of a 'download button' heuristic suggests a lure to trick users into clicking on these links. Although no scripts were extracted, the overall structure and heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://15881588.com/ckupload/files/kowazatabetamelur.pdf In PDF document text
    • http://mstreatmentadvances.com/userfiles/files/zajagusulurari.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/piletufowuzuwusexavoze.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/fizukefurotekisikiv.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/tuxuwuz.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/suzolavorubukineloxa.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/laforunadexafamareluro.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/dekebesage.pdfIn PDF document text
    • http://erex.hu/upload/file/jutazurirevofijuzoporux.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/32944040345.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/81620212630.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/12624715558.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/piwabaretoziw.pdfIn PDF document text
    • http://polipack.ru/content/file/tixuweseponuzafimuzi.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/duxogurefominebureki.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/42353721818.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/vagevanifewikuratopa.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/jebunimenolopopawesuv.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/sazos.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3b1587d9e---naxivamokinidogumukesajo.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/96839299105.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/52009903371.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/zosexajigebotejedad.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/susuxawubolimij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=word+excel+pdf+reader+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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 10440 bytes
SHA-256: a53d3e25f84f79e91281ecd8d42080facdf44acea9fbd364fed7eb657022dfac
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 18488 bytes
SHA-256: 84dfa2cd7051f41094f8f13be0e1f28c7d42bed6544eb94e0528a0fcf870ab2e