Malicious PDF — malware analysis report

Static analysis result for SHA-256 58da2ec752d40b0d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 21:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ceca6fec90bfafd915c88ca2e9484d97 SHA-1: 99077826e2012c3b7326294bcde0dd0b9d8b12ea SHA-256: 58da2ec752d40b0d35fc6c00e0a985deb7011bee65a775c4a707556f3404ead5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sieuthimaycafe.vn/uploads/file/93785232171.pdf In PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/26888312104.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/wukuwixenusubop.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/miluzomirizededi.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/pilezelugasebuwikozere.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/54923637956.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210910151949.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/wewilixibozusofifatono.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/63426572514.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631324642ba03f1aedc8db12cdb9.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/xejetodokoliresevefusig.pdfIn PDF document text
    • https://777mto.info/contents/files/wixazilubovubebokiv.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/25747595576.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/8834921146.pdfIn PDF document text
    • http://coachhouse.info/assets/file/53665539811.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/xixupirixerubelamugikoseb.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/salodebafarig.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/35115230573.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/23463308183.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/fijefazugitovededobe.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a568f3b9---35768149027.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/zapafemazejawopi.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/45035079580.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/xenaju.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/zararutufizedanalax.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/senadasemuvirurufizujawab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+life+of+pablo+original+version+downloadPDF 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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 18104 bytes
SHA-256: 46a03741f88213aa1e74829bc5f7a169364df91c8df0a7187554070231ff33b7
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 10932 bytes
SHA-256: 7278eae7f0ea77a5c01b26e16a2b22605af0baac4f24978439404b90c9273352
font_02_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1