Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19aac7bf139dd74…

MALICIOUS

PDF

81.9 KB Created: 2021-10-17 04:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a0263a72f761b8d1b4c663df3a0af6f1 SHA-1: d52887be103426e11b5195256769c2e1a9ae31d9 SHA-256: c19aac7bf139dd74933506e8d0c5d4fc59a0e56201c5dc2325faf45f16900de2
154 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to PDF files on disposable hosting, suggests an attempt to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a link farm designed for SEO manipulation or to host malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a potential phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161633722839a7---52006929052.pdf In PDF document text
    • http://leoclubmarsala.it/userfiles/files/tabumetin.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/makozogidemiguxo.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/30548885520.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/30333895207.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/judamunas.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/mesiduva.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/74978307815.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/lifisorakisumi.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/1385136474.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/20221689677.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/jedaza.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/65056167923.pdfIn PDF document text
    • http://iviltra.lt/images/files/76143896186.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/80137133665.pdfIn PDF document text
    • http://akademibt.com/resimler/files/gekopujirepaw.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/badadakorub.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/56166670013.pdfIn PDF document text
    • https://veriniams.lt/userfiles/file/11463647161.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/5437289251.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614059a2a89de---83014151873.pdfIn PDF document text
    • http://alptw.com/images/files/pavufefanagunivarinifu.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/64944422737.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/palubojipakajukasew.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/basuvan.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=the+point+lww+activatePDF 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_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 18724 bytes
SHA-256: de9fedbb94a7e6acfcfe9997dbe45ddb6cd6a7e71f9d3df3634cc1e520a2254d
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 10316 bytes
SHA-256: 51dcb498c0932307d75458e334c83878558abdfdcb1ac91d88c088a0cb25e4ee
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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