Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9b5991dd50f9e4…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 22:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac9e0b1ee22235683e64ecdf2413d409 SHA-1: bc532f852825a18b0fb2179a242ff25f9f71a4a8 SHA-256: 9e9b5991dd50f9e44724492078f3123c9d40cfe7beaeb90530202db13553a380
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, indicating a likely attempt to redirect the user to malicious websites for phishing or further payload delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=sanam+teri+kasam+2016+480p+full+hd+movie+free+download PDF link annotation
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/ladeginirumuzigur.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/bivak.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134249c68dcf---87883463345.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/13873410167.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/wovutipefenetolusaxonitup.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/77756291421.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/88828768528.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/85784509142.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/82746691553.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/dipobobobolafu.pdfIn PDF document text
    • http://annabarons.lv/files/files/737991367.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/67897602281.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/88262348683.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/83235055751.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/salazabatuvo.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/liluwikusib.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/88630772635.pdfIn PDF document text
    • http://venkateshservices.com/uploads/52454528668.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/21617578305.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/82275307338.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16140aa8f2b5bf---papajibotipamun.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/30912316061.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/masoxelupawupizep.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/66515057884.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/21191738336.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_off0000d9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 18144 bytes
SHA-256: 8a2ed823decc7923abb4658cf9e2fea0803ed3b90b96a77b6fd7e65cdb9bfeb4
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 11928 bytes
SHA-256: fd716c2e4ba3c3d1a9c842c15330828eb191f228f86798bab2a4896d4e4c0109