Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b361d7bd08b973…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 04:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff767133a0bb3fef7fd329439978eb8e SHA-1: ce3964a815f683f7b633bb0fa00a97fd3b7f27d2 SHA-256: f1b361d7bd08b973c6b64d96db267464e6d00c13503db9b58e0fde5ebc04632c
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious sites or download further payloads. Heuristics like 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' confirm its malicious nature, likely for phishing or malware distribution. The presence of a 'SE_CALLBACK_LURE' heuristic suggests a potential scam or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=wwe+immortals+for+ios PDF link annotation
    • http://thewesternmist.com/userfiles/file/3683506766.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bkfup74mknaj9m86i37jrr5tnl/90497423960.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/94195013977.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/10754503121.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/39794836162.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/pusogufakip.pdfIn PDF document text
    • https://priscar.com/documents/files/4506337128.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/89529340050.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/1937488860.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/58588087995.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/26869529914.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/1078063908.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/dofejuvivadilezesabemo.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/getujedopodewepape.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/sanidiwom.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/72104055582.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/28571537819.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/97617350067.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/wedivufimaramutavumolixu.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/82179061977.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/18291434528.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/44248458498.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/womofuluxuxum.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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 21124 bytes
SHA-256: 2ede9222c49ae81245f83783c2cd8ac75d8160fc5b89dd3e5df3dcabbe213406
font_01_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 10352 bytes
SHA-256: 29a639c5c27bc7570ede59a7e0e7ac0a473aa09e5f0abfdc89c6d6db284b5856