Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c844277ab474c5…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 21:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d86a1d4076da796db6399057fa352e47 SHA-1: 7567e9be393dc0b61560530df1d5879c4b8ab639 SHA-256: c8c844277ab474c5ef5c01226d8da8178cd7755349676063e37af67a271106d5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are likely part of 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.
  • 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://garglob.ru/uplcv?utm_term=legion+phone+antutu PDF link annotation
    • http://turnwealthy.com/ckfinder/userfiles/files/9481231802.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613329613f924---takedafovemonigelal.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/tafegarumejozita.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/55850135747.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/pumavufazuzataduroworiro.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wotajifof.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/38053801178.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/kugexidefiw.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/zopupoziberol.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/22234016716.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/52101700162.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb7ce6e71---42783629880.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/47999790164.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/55701448825.pdfIn PDF document text
    • http://altinay-law.com/images/file/jivagatolajezevumematom.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210905/file/birobebomikoko.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/dovedisujawatafupexanez.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/38834282361.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/daratajokixokisovab.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/xavivosafu.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/walomuxelukujarogimi.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/58271290987.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/zakatirumeguwux.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/wuvafogilubi.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_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 18624 bytes
SHA-256: 78f25db5b4d6d937a11ea08351425f4cb71532627ac7b348525b0d546170e172
font_02_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 10272 bytes
SHA-256: 7bbeae2cfabec0a179eddb50dbb9662bbe8eb4c0f45d96e573b09f4fc0f87d67