Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4cf601bb83688c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 00:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 746b6bcc237f3fd7da38367fb3a155e2 SHA-1: 9600d5603846461a1c9e8d0aa6c0759c15231806 SHA-256: ae4cf601bb83688c3a84108ad0c2f6878f0e490cb87a1fab693bfd1a9af4a320
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sm.ac.th/ckfinder/userfiles/files/35682524528.pdf In PDF document text
    • https://ekoelprom.pl/public/images/editor/file/83986134985.pdfIn PDF document text
    • http://vce34.ru/attachments/file/21202617958.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/nevonifopiriliduzodegoza.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/mofodejulefagozexi.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/sepekenu.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/fifete.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/83181969733.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/33288230460.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/7792960906.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/83797753568.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/v9qf0p5qrsiho1mejc6qd3o4h1/53323858056.pdfIn PDF document text
    • https://polaria.cz/images/file/zagilesudugulolo.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/94748085803.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/98905332424.pdfIn PDF document text
    • http://eventechsite.com/files/files/mojajisarizifewazeg.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/74441423160.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/91444202126.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/85662287947.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/80433739212.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/pifupajegidiporufuno.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/36271605404.pdfIn PDF document text
    • http://egitara.com/upfiles/files/55128040212.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/72677967090.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/26764570759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tv+shows+free+online+websitesPDF 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_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 10404 bytes
SHA-256: 7e8731c30ddb62203c854eb9327ec97d8c62e963394935457418da9b7a7f4b19
font_02_sfnt_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 18176 bytes
SHA-256: 3cf9b6a01b79072056a1a8f7dfb985cae7fffbe3daab5d1e990c89916ddf8745