Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d407a87779bed7…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 19:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8427dce312d117a6fbe59ccf6aa911c3 SHA-1: 8db9ddf0dc263048bddb01a1a67fe9e29d4a0f32 SHA-256: 57d407a87779bed7e47ef0b97490eb75bcfff235b533fabca20dbaa45660c6a1
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. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'SE_CALLBACK_LURE' further suggests a phishing or tech-support scam pretext, likely using the embedded links to facilitate this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=instagram+followers+increasing+automatically PDF link annotation
    • http://ateliergermain.org/sites/default/files/file/kududaruzowokusajotilakob.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/digawidagimuvu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/77668260218.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/wunumifadafalot.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/gebexoxepazerud.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319748cff92---64733433331.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/jonikerabopiden.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/63913713676.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/41303897514.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090407462173499.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/72631121077.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/xulodovipuk.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/zovawarumezesaxe.pdfIn PDF document text
    • http://cataga.de/beta/files/file/16913190634.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/40459974558.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/33146557500.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xizaletiteximuxuwugip.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/67836966339.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/80241939684.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d4e1b098---fosavugosagod.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/90086114770.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/16031894601.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/86068203948.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/mogupukopivetoxatawozi.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/meteke.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/gisesidadowivoniniwuwowak.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_off0000b615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2C 10928 bytes
SHA-256: 37c10c85a342c6f0224d67e225ecd221173fb50f9f9d8a667a983f0be44b2871
font_02_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 15856 bytes
SHA-256: 5f9d0fd7f74b9ee6fd99549d359dd6888c5a39b760bf0f59503a1a4eb6f5eeb6

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