Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2fe40c7e22eb5a…

MALICIOUS

PDF

86.0 KB Created: 2021-10-12 06:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3071eaf23c8325b8b4617373c3766c23 SHA-1: a5cf3107dce6517329205436da2d4940742d3a33 SHA-256: 4c2fe40c7e22eb5ab3f142ab9993322e49aaa768b6156f05d0beef35752547f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and external URI links. The PDF structure suggests it's a link farm designed to redirect users to numerous external domains, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports malicious intent, potentially to exploit vulnerabilities or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://magiepourenfants.com/images/mediamanager/file/21712797693.pdf In PDF document text
    • http://bulongvungtau.com/media/ftp/file/8882252703.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/44911361969.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/sigigawofipawojola.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/riwigarulefafigabimeluj.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/7424046819.pdfIn PDF document text
    • http://lawngo.net/fckfiles/20337974712.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/dewebovuvuwadepofaneke.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/54e6a71d01d154615b2fa3e818f8b18b/zopinarujubukevolefa.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/poxuxepinigomulivosule.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/57525580885.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/27116805425.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/webopidazove.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/76638226210.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/42955214196.pdfIn PDF document text
    • http://ktcz.eu/files/files/8893007523.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/favaxefaretatifereleto.pdfIn PDF document text
    • http://boldogelet.hu/media/20175568809.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/lusisazejevap.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5368aeae6---muvojapowesig.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/rakekitemiginugufatum.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/69873207094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=book+review+example+formatPDF 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_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 19568 bytes
SHA-256: 2c29ee6e45e1519333093d515c7cbd6ed4acf672705fe53b3921519432afde3b
font_02_sfnt_off00013195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13195 10644 bytes
SHA-256: 7aadba2aff55e58022003a75eae2cdc15f78b69405d22a02d531c27d032c5b40